Day 15

day10/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day10"
+version = "0.1.0"

day10/input.txt

@@ -0,0 +1,143 @@
+addx 2
+addx 3
+noop
+noop
+addx 1
+addx 5
+addx -1
+addx 5
+addx 1
+noop
+noop
+addx 4
+noop
+noop
+addx 5
+addx -5
+addx 6
+addx 3
+addx 1
+addx 5
+addx 1
+noop
+addx -38
+addx 41
+addx -22
+addx -14
+addx 7
+noop
+noop
+addx 3
+addx -2
+addx 2
+noop
+addx 17
+addx -12
+addx 5
+addx 2
+addx -16
+addx 17
+addx 2
+addx 5
+addx 2
+addx -30
+noop
+addx -6
+addx 1
+noop
+addx 5
+noop
+noop
+noop
+addx 5
+addx -12
+addx 17
+noop
+noop
+noop
+noop
+addx 5
+addx 10
+addx -9
+addx 2
+addx 5
+addx 2
+addx -5
+addx 6
+addx 4
+noop
+noop
+addx -37
+noop
+noop
+addx 17
+addx -12
+addx 30
+addx -23
+addx 2
+noop
+addx 3
+addx -17
+addx 22
+noop
+noop
+noop
+addx 5
+noop
+addx -10
+addx 11
+addx 4
+noop
+addx 5
+addx -2
+noop
+addx -6
+addx -29
+addx 37
+addx -30
+addx 27
+addx -2
+addx -22
+noop
+addx 3
+addx 2
+noop
+addx 7
+addx -2
+addx 2
+addx 5
+addx -5
+addx 6
+addx 2
+addx 2
+addx 5
+addx -25
+noop
+addx -10
+noop
+addx 1
+noop
+addx 2
+noop
+noop
+noop
+noop
+addx 7
+addx 1
+addx 4
+addx 1
+noop
+addx 2
+noop
+addx 3
+addx 5
+addx -1
+noop
+addx 3
+addx 5
+addx 2
+addx 1
+noop
+noop
+noop
+noop

day10/src/main.rs

@@ -1,3 +1,84 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::read_to_string;
+
+type Register = i32;
+
+enum Instruction {
+    Noop,
+    Addx(Register),
+    Addx2(Register),
+}
+
+impl From<&str> for Instruction {
+    fn from(value: &str) -> Self {
+        match &value.split_whitespace().collect::<Vec<_>>()[..] {
+            ["addx", v] => Self::Addx(v.parse::<Register>().unwrap()),
+            ["noop"] => Self::Noop,
+            _ => panic!("Invalid instruction"),
+        }
+    }
+}
+
+struct Cpu<T> {
+    instruction: Option<Instruction>,
+    x: Register,
+    instructions: T,
+}
+
+impl<T> Cpu<T> {
+    fn new(instructions: T) -> Self {
+        Self {
+            instruction: Some(Instruction::Noop),
+            x: 1,
+            instructions,
+        }
+    }
+}
+
+impl<T> Iterator for Cpu<T>
+where
+    T: Iterator<Item = Instruction>,
+{
+    type Item = Register;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self.instruction {
+            Some(Instruction::Noop) => self.instruction = self.instructions.next(),
+            Some(Instruction::Addx(v)) => self.instruction = Some(Instruction::Addx2(v)),
+            Some(Instruction::Addx2(v)) => {
+                self.x += v;
+                self.instruction = self.instructions.next()
+            }
+            None => return None,
+        }
+        Some(self.x)
+    }
+}
+
+fn main() {
+    let input = "addx 15\naddx -11\naddx 6\naddx -3\naddx 5\naddx -1\naddx -8\naddx 13\naddx 4\nnoop\naddx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx -35\naddx 1\naddx 24\naddx -19\naddx 1\naddx 16\naddx -11\nnoop\nnoop\naddx 21\naddx -15\nnoop\nnoop\naddx -3\naddx 9\naddx 1\naddx -3\naddx 8\naddx 1\naddx 5\nnoop\nnoop\nnoop\nnoop\nnoop\naddx -36\nnoop\naddx 1\naddx 7\nnoop\nnoop\nnoop\naddx 2\naddx 6\nnoop\nnoop\nnoop\nnoop\nnoop\naddx 1\nnoop\nnoop\naddx 7\naddx 1\nnoop\naddx -13\naddx 13\naddx 7\nnoop\naddx 1\naddx -33\nnoop\nnoop\nnoop\naddx 2\nnoop\nnoop\nnoop\naddx 8\nnoop\naddx -1\naddx 2\naddx 1\nnoop\naddx 17\naddx -9\naddx 1\naddx 1\naddx -3\naddx 11\nnoop\nnoop\naddx 1\nnoop\naddx 1\nnoop\nnoop\naddx -13\naddx -19\naddx 1\naddx 3\naddx 26\naddx -30\naddx 12\naddx -1\naddx 3\naddx 1\nnoop\nnoop\nnoop\naddx -9\naddx 18\naddx 1\naddx 2\nnoop\nnoop\naddx 9\nnoop\nnoop\nnoop\naddx -1\naddx 2\naddx -37\naddx 1\naddx 3\nnoop\naddx 15\naddx -21\naddx 22\naddx -6\naddx 1\nnoop\naddx 2\naddx 1\nnoop\naddx -10\nnoop\nnoop\naddx 20\naddx 1\naddx 2\naddx 2\naddx -6\naddx -11\nnoop\nnoop\nnoop";
+    let input = read_to_string("input.txt").unwrap_or_else(|_| input.to_owned());
+    let instructions = input.lines().map(Instruction::from);
+    let signal_strength: Register = Cpu::new(instructions)
+        .enumerate()
+        .map(|(i, x)| {
+            let i = i as Register;
+            let horizontal = i % 40;
+            print!(
+                "{}",
+                if (horizontal - x).abs() <= 1 {
+                    '█'
+                } else {
+                    ' '
+                }
+            );
+            if horizontal == 39 {
+                println!();
+            }
+            (i, x)
+        })
+        .skip(19)
+        .step_by(40)
+        .map(|(i, x)| (i + 1) * x)
+        .sum();
+    println!("signal strength: {signal_strength}");
 }

day11/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day11"
+version = "0.1.0"

day11/input.txt

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 84, 66, 62, 69, 88, 91, 91
+  Operation: new = old * 11
+  Test: divisible by 2
+    If true: throw to monkey 4
+    If false: throw to monkey 7
+
+Monkey 1:
+  Starting items: 98, 50, 76, 99
+  Operation: new = old * old
+  Test: divisible by 7
+    If true: throw to monkey 3
+    If false: throw to monkey 6
+
+Monkey 2:
+  Starting items: 72, 56, 94
+  Operation: new = old + 1
+  Test: divisible by 13
+    If true: throw to monkey 4
+    If false: throw to monkey 0
+
+Monkey 3:
+  Starting items: 55, 88, 90, 77, 60, 67
+  Operation: new = old + 2
+  Test: divisible by 3
+    If true: throw to monkey 6
+    If false: throw to monkey 5
+
+Monkey 4:
+  Starting items: 69, 72, 63, 60, 72, 52, 63, 78
+  Operation: new = old * 13
+  Test: divisible by 19
+    If true: throw to monkey 1
+    If false: throw to monkey 7
+
+Monkey 5:
+  Starting items: 89, 73
+  Operation: new = old + 5
+  Test: divisible by 17
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 6:
+  Starting items: 78, 68, 98, 88, 66
+  Operation: new = old + 6
+  Test: divisible by 11
+    If true: throw to monkey 2
+    If false: throw to monkey 5
+
+Monkey 7:
+  Starting items: 70
+  Operation: new = old + 7
+  Test: divisible by 5
+    If true: throw to monkey 1
+    If false: throw to monkey 3

day11/src/main.rs

@@ -1,3 +1,426 @@
-fn main() {
-    println!("Hello, world!");
+use std::{
+    cmp::{Ordering, Reverse},
+    fs::read_to_string,
+    io::Write,
+    ops::{Add, Div, Mul, Rem, Shl, Sub},
+    rc::Rc,
+    str::Lines,
+};
+
+#[derive(Debug, Clone)]
+struct BigInt {
+    numbers: Vec<u64>,
+}
+
+impl From<i32> for BigInt {
+    fn from(int: i32) -> Self {
+        Self {
+            numbers: vec![int as u64],
+        }
+    }
+}
+
+impl From<u64> for BigInt {
+    fn from(int: u64) -> Self {
+        Self { numbers: vec![int] }
+    }
+}
+
+impl From<u128> for BigInt {
+    fn from(int: u128) -> Self {
+        let lower = ((int << 64) >> 64) as u64;
+        let higher = (int >> 64) as u64;
+        Self {
+            numbers: vec![lower, higher],
+        }
+        .shrink()
+    }
+}
+
+impl Add<BigInt> for BigInt {
+    type Output = BigInt;
+
+    fn add(self, rhs: BigInt) -> Self::Output {
+        let (mut output, other) = if self.numbers.len() > rhs.numbers.len() {
+            (self, rhs)
+        } else {
+            (rhs, self)
+        };
+        let mut carry = false;
+        let mut shortest_length = other.numbers.len();
+        for i in 0..shortest_length {
+            let new_carry;
+            (output.numbers[i], new_carry) = output.numbers[i].overflowing_add(other.numbers[i]);
+            if carry {
+                (output.numbers[i], carry) = output.numbers[i].overflowing_add(1);
+            }
+            carry = new_carry || carry;
+        }
+        while carry {
+            if output.numbers.len() == shortest_length {
+                output.numbers.push(0);
+            }
+            (output.numbers[shortest_length], carry) =
+                output.numbers[shortest_length].overflowing_add(1);
+            shortest_length += 1;
+        }
+        output.shrink()
+    }
+}
+
+impl Sub for BigInt {
+    type Output = BigInt;
+
+    fn sub(self, other: Self) -> Self::Output {
+        let mut s = self;
+        if s < other {
+            panic!("cannot subtract bigger number from smaller number");
+        }
+        let mut carry = false;
+        for i in (0..other.numbers.len()).rev() {
+            let new_carry;
+            (s.numbers[i], new_carry) = s.numbers[i].overflowing_sub(other.numbers[i]);
+            if carry {
+                (s.numbers[i], carry) = s.numbers[i].overflowing_sub(1);
+            }
+            carry = new_carry || carry;
+        }
+        s.shrink()
+    }
+}
+
+impl Mul for BigInt {
+    type Output = BigInt;
+
+    fn mul(self, other: Self) -> Self::Output {
+        let mut output: Self = 0.into();
+        for &digit in other.numbers.iter().rev() {
+            output = (output << 64) + (digit * self.clone());
+        }
+        output.shrink()
+    }
+}
+
+impl Mul<BigInt> for u64 {
+    type Output = BigInt;
+
+    fn mul(self, rhs: BigInt) -> Self::Output {
+        let mut output: BigInt = 0.into();
+        for &digit in rhs.numbers.iter().rev() {
+            output = (output << 64) + (digit as u128 * self as u128).into();
+        }
+        output.shrink()
+    }
+}
+
+impl BigInt {
+    fn div_rem(self, other: Self) -> (Self, Self) {
+        let mut q: Self = Self {
+            numbers: vec![0; self.numbers.len()],
+        };
+        let mut r: Self = 0.into();
+        for i in (0..(self.numbers.len() * 64)).rev() {
+            r = r << 1;
+            let bit_index = i / 64;
+            let bit = i % 64;
+            r.numbers[0] |= u64::from(self.numbers[bit_index] & (1 << bit) != 0);
+            if r >= other.clone() {
+                r = r - other.clone();
+                q.numbers[bit_index] |= 1 << bit;
+            }
+        }
+        (q.shrink(), r.shrink())
+    }
+
+    fn shrink(self) -> Self {
+        let mut s = self;
+        for i in (1..s.numbers.len()).rev() {
+            if s.numbers[i] == 0 {
+                s.numbers.pop();
+            } else {
+                break;
+            }
+        }
+        s
+    }
+}
+
+impl Div for BigInt {
+    type Output = BigInt;
+
+    fn div(self, other: Self) -> Self::Output {
+        let (div, _) = self.div_rem(other);
+        div
+    }
+}
+
+impl Rem for BigInt {
+    type Output = BigInt;
+
+    fn rem(self, other: Self) -> Self::Output {
+        let (_, rem) = self.div_rem(other);
+        rem
+    }
+}
+
+impl Shl<usize> for BigInt {
+    type Output = BigInt;
+
+    fn shl(self, rhs: usize) -> Self::Output {
+        let mut output = self.clone();
+        let q = rhs / 64;
+        let r = rhs % 64;
+        output.numbers.push(0);
+        for i in (1..self.numbers.len()).rev() {
+            output.numbers[i] <<= r;
+            output.numbers[i] |= output.numbers[i] >> (64 - 4);
+        }
+        output.numbers[0] <<= r;
+        for _ in 0..q {
+            output.numbers.push(0);
+            for i in (1..output.numbers.len()).rev() {
+                output.numbers[i] = output.numbers[i - 1];
+            }
+            output.numbers[0] = 0;
+        }
+        output.shrink()
+    }
+}
+
+impl PartialOrd for BigInt {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        let biggest_length = self.numbers.len().max(other.numbers.len());
+        for i in (0..biggest_length).rev() {
+            if i >= self.numbers.len() && other.numbers[i] != 0 {
+                return Some(Ordering::Less);
+            } else if i >= other.numbers.len() && self.numbers[i] != 0 {
+                return Some(Ordering::Greater);
+            } else if i >= self.numbers.len() || i >= other.numbers.len() {
+                continue;
+            } else if self.numbers[i] < other.numbers[i] {
+                return Some(Ordering::Less);
+            } else if self.numbers[i] > other.numbers[i] {
+                return Some(Ordering::Greater);
+            }
+        }
+        Some(Ordering::Equal)
+    }
+}
+
+impl PartialEq for BigInt {
+    fn eq(&self, other: &Self) -> bool {
+        self.partial_cmp(other) == Some(Ordering::Equal)
+    }
+}
+
+type Item = BigInt;
+
+#[derive(Clone)]
+struct Monkey {
+    index: usize,
+    items: Vec<Item>,
+    inspected_items: usize,
+    operation: Rc<dyn Fn(Item) -> Item>,
+    test_divisible_by: Item,
+    test_true: usize,
+    test_false: usize,
+}
+
+impl std::fmt::Debug for Monkey {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Monkey")
+            .field("index", &self.index)
+            .field("items", &self.items)
+            .field("inspected_items", &self.inspected_items)
+            .field("test_divisible_by", &self.test_divisible_by)
+            .field("test_true", &self.test_true)
+            .field("test_false", &self.test_false)
+            .finish()
+    }
+}
+
+impl Monkey {
+    fn parse(input: &mut Lines) -> Option<Self> {
+        let mut input = input
+            .take_while(|line| !line.is_empty())
+            .map(|line| line.split_whitespace().collect::<Vec<_>>());
+        let index = match &input.next()?[..] {
+            ["Monkey", i] => i.replace(':', "").parse().unwrap(),
+            l => panic!("invalid line: {l:?}"),
+        };
+        let line = input.next()?;
+        let items = match &line[..2] {
+            ["Starting", "items:"] => line[2..]
+                .iter()
+                .map(|n| n.replace(',', "").parse::<u64>().unwrap().into())
+                .collect::<Vec<_>>(),
+            l => panic!("invalid line: {l:?}"),
+        };
+        let operation: Rc<dyn Fn(Item) -> Item> = match &input.next()?[..] {
+            ["Operation:", "new", "=", "old", "+", "old"] => Rc::new(|old| old.clone() + old),
+            ["Operation:", "new", "=", "old", "+", n] => {
+                let n: Item = n.parse::<u64>().unwrap().into();
+                Rc::new(move |old| old + n.clone())
+            }
+            ["Operation:", "new", "=", "old", "*", "old"] => Rc::new(|old| old.clone() * old),
+            ["Operation:", "new", "=", "old", "*", n] => {
+                let n: Item = n.parse::<u64>().unwrap().into();
+                Rc::new(move |old| old * n.clone())
+            }
+            l => panic!("invalid line: {l:?}"),
+        };
+        let test_divisible_by = match &input.next()?[..] {
+            ["Test:", "divisible", "by", n] => n.parse::<u64>().unwrap().into(),
+            l => panic!("invalid line: {l:?}"),
+        };
+        let test_true = match &input.next()?[..] {
+            ["If", "true:", "throw", "to", "monkey", n] => n.parse().unwrap(),
+            l => panic!("invalid line: {l:?}"),
+        };
+        let test_false = match &input.next()?[..] {
+            ["If", "false:", "throw", "to", "monkey", n] => n.parse().unwrap(),
+            l => panic!("invalid line: {l:?}"),
+        };
+        Some(Self {
+            index,
+            items,
+            operation,
+            test_divisible_by,
+            test_true,
+            test_false,
+            inspected_items: 0,
+        })
+    }
+
+    fn execute_round(
+        &mut self,
+        relief: impl Fn(Item) -> Item,
+    ) -> (usize, Vec<Item>, usize, Vec<Item>) {
+        let (items_true, items_false) = self
+            .items
+            .iter()
+            .map(|item| (self.operation)(item.clone()))
+            .map(relief)
+            .partition(|item| item.clone() % self.test_divisible_by.clone() == 0u64.into());
+        self.inspected_items += self.items.len();
+        self.items = vec![];
+        (self.test_true, items_true, self.test_false, items_false)
+    }
+}
+
+fn execute_round(monkeys: &mut [Monkey], relief: impl Fn(Item) -> Item) {
+    for index in 0..monkeys.len() {
+        let (index_true, mut items_true, index_false, mut items_false) =
+            monkeys[index].execute_round(&relief);
+        monkeys[index_true].items.append(&mut items_true);
+        monkeys[index_false].items.append(&mut items_false);
+    }
+}
+
+fn calc_monkey_business(monkeys: &[Monkey]) -> usize {
+    let mut inspected_items = monkeys
+        .iter()
+        .map(|monkey| monkey.inspected_items)
+        .collect::<Vec<_>>();
+    inspected_items.sort_by_key(|&items| Reverse(items));
+    inspected_items.iter().take(2).product()
+}
+
+fn main() {
+    let input = "Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1";
+    let input = read_to_string("input.txt").unwrap_or_else(|_| input.to_owned());
+    let mut lines = input.lines();
+    let mut monkeys = vec![];
+    while let Some(monkey) = Monkey::parse(&mut lines) {
+        lines.next();
+        monkeys.push(monkey);
+    }
+    let min_product: Item = monkeys
+        .iter()
+        .map(|monkey| monkey.test_divisible_by.clone())
+        .fold(1u64.into(), |p, i| p * i);
+    let mut monkeys2 = monkeys.clone();
+
+    for _ in 0..20 {
+        execute_round(&mut monkeys, |item| item / Item::from(3u64));
+    }
+
+    let monkey_business = calc_monkey_business(&monkeys);
+    println!("monkey business: {monkey_business}");
+
+    println!("starting 10000 iterations");
+    for i in 0..10_000 {
+        print!("executing round {i}\r");
+        std::io::stdout().flush().unwrap();
+        execute_round(&mut monkeys2, |item| item % min_product.clone());
+    }
+    let monkey_business = calc_monkey_business(&monkeys2);
+    println!("monkey business: {monkey_business}");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::BigInt;
+    #[test]
+    fn big_int() {
+        let x: BigInt = 1.into();
+        let y: BigInt = 1.into();
+        assert_eq!(
+            x.clone() << 64,
+            BigInt {
+                numbers: vec![0, 1]
+            }
+        );
+        assert_eq!(
+            x.clone() << 2,
+            BigInt {
+                numbers: vec![0b100, 0]
+            }
+        );
+        assert_eq!(
+            x.clone() << 65,
+            BigInt {
+                numbers: vec![0, 2, 0]
+            }
+        );
+        assert_eq!(x.clone() + y.clone(), 2.into());
+        assert_eq!(x.clone() - y.clone(), 0.into());
+        assert_eq!(x.clone() * y.clone(), 1.into());
+        assert_eq!(x.clone() / y.clone(), 1.into());
+        assert_eq!(x % y, 0.into());
+
+        let x: BigInt = 101.into();
+        let y: BigInt = 10.into();
+        assert_eq!(x.clone() + y.clone(), 111.into());
+        assert_eq!(x.clone() - y.clone(), 91.into());
+        assert_eq!(x.clone() * y.clone(), 1010.into());
+        assert_eq!(x.clone() / y.clone(), 10.into());
+        assert_eq!(x % y, 1.into());
+    }
 }

day12/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day12"
+version = "0.1.0"

day12/input.txt

@@ -0,0 +1,41 @@
+abcccccccccccccccccccccccccccccccccccccaaaaaaacccccccaaaaaaaaaaaccccccccccccccccccccaaacaaaaaaaacccccccccccccccccccccccccccccccccccaaaaa
+abccccccccccccccccccaaccaacccccccccccccaaaaaaaccccccccaaaaaaaaaaacccccccaaaaccccccccaaaaaaaaaaaaacccccccccccccccccccccccccccccccccaaaaaa
+abccccccccccccccccccaaaaaaccccccccccaaaccaaaaaacccccccaaaaaaaaaaccccccccaaaaccccccaaaaaaaaaaaaaaacccccccccccccccccccaaacccccccccccaaaaaa
+abcccccccccccccccccccaaaaacccccccccccaaccaacaaaccccccaaaaaaaaaaaccccccccaaaacccccaaaaaaaaacaaaaaaacccccccccccccccccaaaacccccccccccaaacaa
+abccccccccccccccccccaaaaaaccccccccaacaaaaaacccccccccaaaaaaaaaaaaacaaaccccaaccccccaaaaaaaaacaacccccccccccccccccaaaccaaaacccccccccccccccaa
+abcccccccccccccccccaaaaaaaacccccccaaaaaaaaccccccaaaaaaaacaaaacaaaaaaacccccccccaaccccaaaaaacaaacccccccccccccccaaaakkkaaccccccccccccccccaa
+abcccccccccccccccccaaaaaaaaccccccccaaaaaccccaacccaaaaaaaaaaaacaaaaaaccccccccccaacccaaaaaaaaaaaacccccccccccccccakkkkkklcccccccccccccccccc
+abaaacccccccccccaaccccaaccccccccccccaaaaaccaaacccaaaaaaaaaaaaaaaaaaaaccccccaaaaaaaacaacccaaaaaaccccccccccccccckkkkkkkllcccccccaaaccccccc
+abaaaacccccccaacaaccccaacccccccccccaaacaaaaaaaccccaaaaaaaaaaaaaaaaaaaacccccaaaaaaaaaaaccccaaaaacccccccccccccckkkksssllllccccccaaaaaacccc
+abaaaacccccccaaaaacccccccccccaaaccccaacaaaaaaccccaaaaaacaaaaaaaaaaaaaacccccccaaaaccccccccaaaaacccccccccccccckkkksssssllllcccccaaaaaacccc
+abaaacccccccccaaaaaaccccccccaaaaccccccccaaaaaaaacaaaaaaaaaaaaacaaacaaacccccccaaaaacccccccaaaaacccccccccccccjkkkrssssssllllccccccaaaccccc
+abccccccccccaaaaaaaaccccccccaaaacccccccaaaaaaaaacaacaaaaaaaaaacaaaccccccccccaaacaaccccccccccccccccccccccccjjkkrrsuuussslllllcccccaaccccc
+abccaaacccccaaaaacccccccccccaaaaccccccaaaaaaaaaacccccaaaaaaaaaacaaccccccccccaacccacccccccccccccccccccccjjjjjjrrrsuuuussslllllmcccddacccc
+abcccaaaccaccacaaaccccccccccccccccccccaaaaaaaccccccccccaaaaaaaaccccccaacccccccccccaaaaacccccccccccccccjjjjjjrrrruuuuuusssllmmmmmddddcccc
+abccaaaaaaaacccaaaccccccccccccccccaaacccccaaaccccccccccccaaacccccccccaacccccccccccaaaaacccccccccccccjjjjjrrrrrruuuxuuussqqqqmmmmmdddcccc
+abcaaaaaaaacccaaaaaacaaaaaccccccaaaaaaccccaaacccaaccccccccaaccccccaaaaaaaaccaaacccaaaaaaccccccccccccjjjjrrrrrruuuxxxuuuqqqqqqqmmmdddcccc
+abaaaaaaaaaccccaaaaacaaaaaccccccaaaaaaaaccccccaaaaaaccccccccccccccaaaaaaaaccaaacaaaaaaaacccccccccccjjjjrrrtttuuuuxxxyvvvvvqqqqmmmdddcccc
+abaaaaaaaaaccaaaaaaacaaaaaaccccccaaaaaaaacccccaaaaaaccccccccccccccccaaaaccaaaaaaaaaaaaaacccccccccaaiijqqqrttttuuuxxyyvvvvvvvqqmmmdddcccc
+abcaaaaaaaaccaaaaaaaaaaaaaacccccaaaaaaaacccccccaaaacccccaaaaccccccccaaaaacaaaaaaaaccaaccccccccccaaaiiiqqqttttxxxxxxyyyyyyvvvqqmmmdddcccc
+abcccaaaaaaacaaaaaaaaaaaaaacccccaaaaaaaaaaaccccaaaaccccaaaaacccccccaaaaaacaaaaaaacccccccccccccccaaaiiiqqqtttxxxxxxxyyyyyyvvqqqmmmdddcccc
+SbcccaacccaccccaaacacccaaacccccccccaaaaaaaaacccaccaccccaaaaaaccccccaaccaacccaaaaaccccccccccccccccaaiiiiqqtttxxxxEzzzyyyyvvvqqqmmmddccccc
+abccaaaccccccccaaccccccccccccccccccaaaaaaaaccccccccccccaaaaaaccccccccccccccaaacaaaccaacccccccccccccciiiqqqttttxxxyyyyyvvvvqqqmmmdddccccc
+abccccccccccccccccccccccccccccccccaaaaaaaccccccccccccccaaaaaacccccccccccccccaacccccaaaaaaaccccccccccciiiqqqttttxxyyyyyvvvrrrnnneeecccccc
+abcaaaaccccccccccccccccccccccccccaaaaaaaaccccccccccccccccaacccccccccccccccccccccccccaaaaacccccccccccciiiqqqqttxxyyyyyyyvvrrnnnneeecccccc
+abcaaaaacccccccccccccccccccccccccaaaacaaacccaccaaacccccccccccccccccccccccccaaaccccaaaaaaaccccccccccccciiiqqqttwwyywwyyywwrrnnneeeccccccc
+abaaaaaacccaccaccccccccccccccccccaaaaccaacccaaaaaaccccccccccccccccaaaccccaaaaaacccaaaaaaaacccccccccccciiiqqqtswwwwwwwwwwwrrnnneeeccccccc
+abaaaaaacccaaaaccccccccaaaacccccccaaacccccccaaaaaacccccccccccccccaaaaaaccaaaaaacccaaaaaaaacaaccccccaaciiiqppsswwwwsswwwwwrrrnneeeccccccc
+abcaaaaacccaaaaacccccccaaaacccccccccccccccccaaaaaaaccccccccccccccaaaaaaccaaaaaacccccaaaaaaaaaccccccaaaahhpppssswwsssswwwwrrrnneeeacccccc
+abcaaaccccaaaaaacccccccaaaaccccccccccccccccaaaaaaaaccccccccccccccaaaaacccaaaaaccccccaacaaaaaaaaccaaaaaahhpppsssssssssrrrrrrnnneeeacccccc
+abccccccccaaaaaaccccccccaacccccccccccccccccaaaaaaaaccccaacccccccccaaaaaccaaaaacccccccccaaaaaaaaccaaaaachhpppssssssoosrrrrrrnnneeeaaacccc
+abccccccccccaaccccccccccccccccaaaaaccccccaacccaaacccaaaaacccccccccaacaacccccccccccccccccaaaaaaacccaaaaahhhppppssppooooorroonnffeaaaacccc
+abaaccccccccccccccccccccccccccaaaaaccccccaacccaaaccccaaaaacccccccccccccccccccccccccccaacaaaaacccccaacaahhhppppppppoooooooooonfffaaaacccc
+abaccccccccccccccccccccccccccaaaaaacccaaaaaaaacccccccaaaaaccccccccccccccccccccccccaaaaaaaaaaaccccccccccchhhpppppppgggoooooooffffaacccccc
+abaccccccccccccccccccccccccccaaaaaacccaaaaaaaaccccccaaaaaccccccacccaacccccccccccccaaaaaccccaaccccccccccchhhhhhggggggggfffffffffaaacccccc
+abaacccccccccccccccccccccccccaaaaaacccccaaaacccccccccaaaacccaacaacaaacccccccccccccaaaaaaacccccccccccccccchhhhgggggggggffffffffccaacccccc
+abcccccccaacccccccccccccccccccaaaccccccaaaaaccccccccaaaaccaaaacaaaaacccccccccccccaaaaaaaaccccccccccccccccchhhggggaaaagffffffcccccccccccc
+abcccccccaacccccccccccccaacccccccccccccaaaaaaccaaccccaaaaaaaaacaaaaaacccccccaaaacaaaaaaaacccccccccccaacccccccaaaacaaaacccccccccccccccccc
+abccccaaaaaaaacccccccaacaaaccccccccccccaaccaacaaaacccaaaaaaaacaaaaaaaaccccccaaaaccacaaaccaaaccccaaaaaacccccccaacccaaaacccccccccccccaaaaa
+abccccaaaaaaaacccccccaaaaaccccccccccccccccccccaaaaccccaaaaaaacaaaaaaaaccccccaaaaccccaaaccaaaaaccaaaaaaaacccccccccccaaaccccccccccccccaaaa
+abccccccaaaaccccccccccaaaaaaccccccccccccccccccaaaacccaaaaaaaaaaccaaccccccccccaacccccccccaaaaacccaaaaaaaacccccccccccaaaccccccccccccccaaaa
+abcccccaaaaaacccccccaaaaaaaacccccccccccccccccccccccaaaaaaaaaaaaaaaacccccccccccccccccccccaaaaaacccaaaaaaaccccccccccccccccccccccccccaaaaaa

day12/src/main.rs

@@ -1,3 +1,178 @@
-fn main() {
-    println!("Hello, world!");
+use std::{collections::HashSet, fs::read_to_string};
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum Tile {
+    Start,
+    End,
+    Hight(u8),
+}
+
+impl From<char> for Tile {
+    fn from(input: char) -> Self {
+        match input {
+            'S' => Self::Start,
+            'E' => Self::End,
+            h => Self::Hight(('a'..='z').position(|c| c == h).unwrap() as u8),
+        }
+    }
+}
+
+impl Tile {
+    fn can_move_to(self, other: Tile) -> bool {
+        if let Self::Hight(h1) = self {
+            if let Self::Hight(h2) = other {
+                return h1 + 1 >= h2;
+            }
+        }
+        if self == Self::Start {
+            return other == Self::Hight(0) || other == Self::Hight(1);
+        }
+        if other == Self::End {
+            return self == Self::Hight(('a'..='z').position(|c| c == 'z').unwrap() as u8);
+        }
+        false
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+struct Map<T> {
+    map: Vec<T>,
+    width: usize,
+    height: usize,
+}
+
+impl From<&str> for Map<Tile> {
+    fn from(input: &str) -> Self {
+        let width = input.lines().map(|line| line.len()).next().unwrap();
+        let height = input.lines().count();
+        let map = input
+            .lines()
+            .flat_map(|line| line.chars().map(Tile::from).collect::<Vec<_>>())
+            .collect::<Vec<_>>();
+        Self { map, width, height }
+    }
+}
+
+impl<T> Map<T> {
+    fn at(&self, point: (usize, usize)) -> &T {
+        let (x, y) = point;
+        let index = x + y * self.width;
+        &self.map[index]
+    }
+
+    fn at_mut(&mut self, point: (usize, usize)) -> &mut T {
+        let (x, y) = point;
+        let index = x + y * self.width;
+        &mut self.map[index]
+    }
+}
+
+fn update(
+    from: (usize, usize),
+    to: (usize, usize),
+    path: &mut Map<Option<u32>>,
+    map: &Map<Tile>,
+    changed: &mut bool,
+) {
+    if !map.at(from).can_move_to(*map.at(to)) {
+        return;
+    }
+
+    let Some(c) = path.at(from) else {return};
+    let cost = path.at(to);
+    let cost = cost.unwrap_or(u32::MAX);
+    if cost <= c + 1 {
+        return;
+    }
+
+    *path.at_mut(to) = Some(c + 1);
+    *changed = true;
+}
+
+fn find_shortest_path(map: &Map<Tile>) -> Option<u32> {
+    let mut path = Map {
+        map: vec![None; map.width * map.height],
+        width: map.width,
+        height: map.height,
+    };
+    let mut start = (0, 0);
+    let mut end = (0, 0);
+    for x in 0..map.width {
+        for y in 0..map.height {
+            match map.at((x, y)) {
+                Tile::Start => start = (x, y),
+                Tile::End => end = (x, y),
+                _ => (),
+            }
+        }
+    }
+    *path.at_mut(start) = Some(0);
+
+    let mut changing = true;
+    while changing {
+        changing = false;
+        for x in 0..map.width {
+            for y in 0..map.height {
+                let point = (x, y);
+                if x != 0 {
+                    update((x - 1, y), point, &mut path, map, &mut changing);
+                }
+                if y != 0 {
+                    update((x, y - 1), point, &mut path, map, &mut changing);
+                }
+                if x != map.width - 1 {
+                    update((x + 1, y), point, &mut path, map, &mut changing);
+                }
+                if y != map.height - 1 {
+                    update((x, y + 1), point, &mut path, map, &mut changing);
+                }
+            }
+        }
+    }
+    *path.at(end)
+}
+
+fn find_best_start(map: &Map<Tile>) -> u32 {
+    let mut start = (0, 0);
+    let mut possible_starts = HashSet::new();
+    for x in 0..map.width {
+        for y in 0..map.height {
+            match map.at((x, y)) {
+                Tile::Start => {
+                    possible_starts.insert((x, y));
+                    start = (x, y);
+                }
+                Tile::Hight(0) => {
+                    possible_starts.insert((x, y));
+                }
+                _ => (),
+            }
+        }
+    }
+    let mut map = map.clone();
+    *map.at_mut(start) = Tile::Hight(0);
+
+    possible_starts
+        .iter()
+        .flat_map(|&start| {
+            let mut map = map.clone();
+            *map.at_mut(start) = Tile::Start;
+            find_shortest_path(&map)
+        })
+        .min()
+        .unwrap()
+}
+
+fn main() {
+    let input = "Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi";
+    let input = read_to_string("input.txt").unwrap_or_else(|_| input.to_owned());
+    let map: Map<_> = (&*input).into();
+    let cost = find_shortest_path(&map);
+    println!("{cost:?}");
+    let cost = find_best_start(&map);
+    println!("{cost}");
 }

day13/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day13"
+version = "0.1.0"

day13/input.txt

@@ -0,0 +1,449 @@
+[[1,[0,3,5,[2,1,3,3,5]],4,[[],5]],[],[0,[7,[5],7,7]]]
+[[[],[[],[5,2,8,9,7],1,5],[3,[]]]]
+
+[[[[1,3,6],[7,9,2,7],[5,0,5,8,4]]],[[8,2,6,[]],[],1,6]]
+[[5,10,4],[6,9,8],[5,[4,[3,8,1,5,1],[4],6,[3]],[[0]],[10],[[5,7],[5,1,1,4,7],[]]],[[[9,7,5,7],[5,1,7,3,1],[8,4,2]],5,[[8,9,3,4,4],4,[2,4,2],3,[6,10,5,7]],9],[[1]]]
+
+[[[[2,7,2],2],[],[[5],[8,3],3],8]]
+[[7,1,[0,2],[[1,8,2,0]],[[3],[5,2,5,3,6]]],[3,[6,[4,4,5],[8],1,4]],[]]
+
+[9,3,3,10,7]
+[9,3,3,10]
+
+[[7,3,10,[6,2]],[[]]]
+[[[[3,2,0,8],8,1]]]
+
+[[[[6],0,[10]],7],[1,[[3,7,4]]],[[0]],[[],[]],[[[10,8,4,4,2]]]]
+[[[5,10,0,8],8,10,[[8,9,8,7,7]]],[6],[[6],[5,8,8],1,[4,[6,2]],9],[[[],[9,0],10,[7,1],5],[8,8,[8,6]]],[[[2,2],10],2,3]]
+
+[[],[3],[],[[4,10,[6]]],[3,[[8,1,10,6],[],[9],4]]]
+[[9,[4],7,10,1],[[0,[1,3,9,1],[9,5,3,3,0]],2,3],[4,10,[[7,8,6,10,1],9,[0,2,1],5]],[[[5],2],[[4,2,1,9],[4]]]]
+
+[[[[7,2],[8,2,1]],9,[],9,4]]
+[[4,8,10],[[[4,7],9,[0,7,3,9,0],7],[10,5],4]]
+
+[[],[],[[],[[9,7,5,2],[4,4,7,4],1,10,[10,10,4,9,5]],1],[8,[],2,[10,3,[],[]]]]
+[[[[5,7,3],2]],[[[6,4],6],[],8],[8,[[10,3],[7,1,9],[3,7,7],[6,10,1,6],3],[],3],[[[10,0]],4,6,[6]],[[[10,8,7,1],[],2],[[4,7,9,4],7,2],0,0]]
+
+[[5,[[],[10,7,1]],2,9,7],[[[3],[4,7,1,0,0],4,[8,9,4],7],[[8,10,4,5,3],[2,3,0,4,10],0],[[6,3,10,8],9,3,[4,6],[0]],8,10]]
+[[],[[[4,10,6],[],[3,5],10],9,[0,[],[],[5],3],6]]
+
+[[10,[1,[4,10,0,6],3],2],[2,[4,4,4,7],[4,4,2,[2,4],[1,2,8,3]],[]],[[[5],3],5,[]],[],[[],3]]
+[[10,[6,9,[1,1],[4,3,5,3,3],[]],8,5],[[6,0],1],[[1],[[4]],5],[[2],[5,[8],[6,5,0,2,10],[7,3],[5,5,5,2]],[8,3,2],0],[6,[]]]
+
+[[],[],[0,4,[[3],1,10],[8,7,5]]]
+[[],[[2,5,3],[[10,6,4,1]],1,5]]
+
+[[[],8,[0,[1,0,1,8],5],[]],[10,[[6,6,8,2,5],[5,8,4,5,8],[],9,8]],[],[],[[[0,5,5,9,0],5],6,[]]]
+[[1,7],[[],9,3,[6,4,[3],7,[]]],[[0,1],0,10,7]]
+
+[[[[9,2,3,2,3],[7,7,4],[4],9,3]],[6,0,[2,1]],[0,0],[[3],6],[]]
+[[[[7,3],3,[8,2,3,5,2]],7],[6,[[6,7],[],[],0,[0,1,5,7]],[[],3,4],4,[]],[[8,8,3,10,[2,5,5,6,3]],1,3],[9,10]]
+
+[[[],[],[9],[],4],[6,3,6,7],[[0,[8,7],8,7],4,[2],[],2],[[4,10,5,7,[3,6,8,2]],[[],[3],7,[3,1,0,0,4]]]]
+[[3,6,[[1],[8],[8,0],[0,5,5,3,7]],9,7]]
+
+[[3,5,[],2,3]]
+[[[[4,3,4,10,1],[4,0,9],5,8,[4,2]],9,[9,9],1,[4,3,[7,3,5,7]]],[6,[],[],6],[[10,[],[4],[],[2,0,9,5,5]]],[[5],[4,5,[0,1],4],3],[[[],8],3]]
+
+[[[],[9],[],[],[]]]
+[[[[6,0,8,1],2,[5,0,3,9],[0],9],4]]
+
+[[[]],[[[5,10,1,7],[4,3,2,9,10],[4,10],10]],[6],[4,1,[5,[8,8,9,10]]]]
+[[[7,[6,1,9,6],[2,3,8,8]],10,[[],[6,2],10,7,[6,10,9]]],[[1]],[[6,[5,1,2,4],3]],[[8,9],4,8,10,[9,8,10]],[[3,9,2,[2,5,1]],1]]
+
+[[1,[8,6,[0,7,3,10,6]],6],[8,[[1,4],1],7,6],[],[[]],[[[1,5,7,2],8,0],[]]]
+[[9],[10],[[[9],9,2,[0,3,4,5]]],[[4,9,[9,2]],[]]]
+
+[[[4],8,[3,[6,9],[7,9,4]],[3,0,[]],[]]]
+[[],[9,[[6],[2,4],[],[3,0,0,6],9],[[2,4,0,3]]]]
+
+[[8,[[1,7,5,9,6],7],9],[9,5,[2,3,[]],[7,6,[10,1,1,4,1]],[]],[[[8,0,2,6,4],5],[[2,5,0],[2,10,4],2,2],1],[1,[[7,6,6],[10,10,2,9,10],[2,3,7,10,9],[10,5],[3,3,9,5,6]],[[6,8]],[],[5,4,0,[]]],[9]]
+[[3,[[4],[]]],[],[8,[1],1,3],[[1,7,7,3],[[3],2],2,[8]]]
+
+[[8,[9,[10]],7,[[1,0]],[[4,8,5],[9],0,9]],[[8,[8,7,7],0,0,1],0]]
+[[],[[0],[]],[[[5,4,3],[0],6,[4],3],6],[3,1]]
+
+[[[[0,5],[7],[2,4,7,8,0],2]],[],[],[3,4,7],[]]
+[[5,[[4]],9,5,5]]
+
+[[[[6,7],9,9,8,2]]]
+[[2],[[],[[1],10,[6],10],[1,[9,4,8,7,10],[8,10,8,5]],[1,7,9,5]]]
+
+[[5,2,[7],[4]]]
+[[0,[[5],4,9,1,[0,5,5,6,2]],[5],9,[6,0,10,[10,8]]],[],[[8,5,[8],[5,9,6],[4,4]],[3],[[4,5],[1,9,10]],[7,1,7]],[0]]
+
+[[[],[0,9],2,7,9]]
+[[[],[10,4,2,[3,9]],[[7,7,7,1],[2,2,0],[6,10],[10,1,7,9]],9],[],[3,[[0,9],3,[8,10,6,4]],[[5,3,3,10,5],[8,4],9],[[],0,9]],[2,10,7,[[5,1,1],3]],[]]
+
+[[[5,[4,5,2,2,8]]],[4]]
+[[],[0],[]]
+
+[[7,[]],[3,[2,[0,6],2,[10,5,10,3],[4]]]]
+[[1,6,[[9],9,2,[1,4,4,3,4]],[[8,2],[10,3,1],[4,9,4],[6,8],[0]]],[9,[1,[],0,2,0],[[6,7],4,1,[3,10,0,7,1],[]],3,[8,[9],1,3,9]],[10,[10],9],[[9],[[0,5,8,2],[],4,10,[10,7,2,8]],[5],[],[[2,8,9,3]]],[]]
+
+[[9,3,[[],[],[1,4,7],[10,2,10,3,1],[]],5,[[5,3,3,0,7],6,9]],[5,[[],9,9,[1,10,5,7],3],[[6],[],[10,3,2],7],10]]
+[[4],[3,[0,[],[8,10,8],8,[3,5,5,2]]],[[9,7,[],[5,7,2,9],[]]],[[9,[4,8,4,10],4,2,7],9,10,5,[9,6,7,6,6]]]
+
+[[],[5,6,[3],4,3],[[8,6,[],8],5],[8,[8,2]]]
+[[8,[],[2]],[[[10,8,3,1],5,[2,7],7,8],3,0,6,9]]
+
+[[[[3,9,5,8,1]],[7,[],[4],[],[]]],[7,10,9,[[8,8,2,3],4]],[[10,[3,2,2],10,9],2,4,[8],1],[[1,2,3,[]]],[[10,8,[7,9,6,2]],[3,4,[1,10,5,3,9],6],[7],2]]
+[[[[7,0],6],[4,[10,6,9,8,1]],[0,4,9,8,0],[[]]],[]]
+
+[[],[]]
+[[8,0,9,[[2]],[]]]
+
+[[[],[[10,1,8,10,1],6,8],10,[[9],[],0],[[9,5],7,[10,7],6]]]
+[[],[],[7,[],[],[[1,8],7,6],[[2,1,1],9,[4,9,2,9,6],[3]]],[[[6,5],[2,10,3],6,[8]],[[7,2],[5,9],[],2,1],[[3],9,[0]]],[[[],6,9],[],[[7,3],5],[[]]]]
+
+[[],[9,[[4,6,9],[9,1,9,1,10],[0,0,5,10]]],[[],[[7],[7,6,4,1,4],7,[0],[10,3,5,0]],[]],[5]]
+[[[]],[],[[2,[0,8],9,6,[4]],[7,[3,7],[1,7,6,7,7],[6,9,7,3,8],[2]],[10,[5,3,1,8,8],2,8,[]],0],[4,[7,0,[]],6]]
+
+[[[9,9,7],[[8,0,3,0],6,[],10,2],1],[8,[],[[6,4],1],10],[2,[4],[2,2],8],[4,[[],[2,10,4,1,10],3],5,9]]
+[[4]]
+
+[[[[10,6,6,10],[],[],8,5],[[8,10],10],10],[6,[5,8,[],[]]],[[0],1]]
+[[[6],[2,[8,2],8,5,[6,9,4]],[[],10,[9,1,9,9]]],[8,[],10,[[0]],[[]]],[],[4]]
+
+[[[],[1]],[[10,[]],[[5,6,8,4],[0],[5,6],0,[10]]],[],[[4,6,[8,9,7],0],[],[[3],1,8,6],[[8],10,5,[7,0,10,8,9]],[[10,3],10,[0,6],[],[0,10,2,3]]],[]]
+[[9,10,8,0,3],[5],[5,5,5],[[1,8],1,5]]
+
+[[[[7,1,7],1,[1,9,6,9,1]],[10,[0,9,3,6]]]]
+[[5],[[[],2,[9],2,4],5],[]]
+
+[[],[[],2]]
+[[0,10,[6,[7],8]],[],[6,1,6]]
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+[[[5,[5,4,3,1,10]],[10,4],7,[[6,6,2],1,[2,6,4,4],[7,9,2]]],[[[10,4]],9,6,2,2],[[]]]
+[[[],1,0],[2],[],[[6],6,0,[]],[[],2]]
+
+[[],[[9,[1,4,5],8,3],[[],[2,9,5,3],10,4,8],[2],7],[4]]
+[[[[5]]],[8,[],5,[[7,3,9,5]],[6,10]],[8,4,[[1,0,2,0,4]],[6,6,[5]]],[[[6,7,4,2,4]]]]
+
+[[[2],6]]
+[[4,4,6,[[0,3,9,5],10,[8,4],[9,6]]],[10,6,6,0,[[],4]],[],[[5,9,0,[5],8]]]
+
+[[10,7,4],[3,[],0,[3,1]],[],[5,[1,[6,4]],1,10],[]]
+[[[1,6],3]]
+
+[9,3,1,7]
+[9,3,1,7,6]
+
+[[6,10,[[10,9,2],[2],2]]]
+[[[],[6,[2,3,7,1,9]],[[7,7,6]],[[],8,[8,2,5]],[6,[5],[5,7,8,3],[0,7,9]]]]
+
+[[5,[7,[2,10,5],1],[[],[],[]],[[],1,3],4],[4,[[],[10,2,4],10,9],[7,[9,0,9,7],[8,8,9],[],[1,4,6]],[[4,6,2],[],2,[],5]],[3,8,[0,7,[6],[6]]],[1,[10,9,[3,5]],5]]
+[[9,[0,[3],[9,10,9,9]],10,5,10],[0,6,4,[[3,6,0,0,6],10,0]],[10,9,9,6],[]]
+
+[[0,8],[[[0]],[8],0],[[[]],9,[8]],[1,9,[9,4,7,[5,3,8],7],[7,[7,1],[10,1,6,8]],[]],[[[],[10,6,5,9]],0,2,[],[]]]
+[[[],0,[[4,9,3,8],1,4,6],[5]],[[7],[[],9,[],[5,3,8,10,8],[3]],2,10,[5]],[[[],[9,8,0,10,7]]],[]]
+
+[[4,7],[],[4],[3,9,[[1,6,1,0],1,[2,9,2],4,[10,7,4,4,0]]]]
+[[[9],[1,[2,9,9],[3,8],1,5],2],[],[[[5,0],[4],7,2],[9],2,[[],[0,8]],9],[3],[4,8,[4]]]
+
+[[8,5,4]]
+[[3,[],8,6,6],[],[[],10,1,[0,[1]],[[3,8,5],[1,7,6],[],1]]]
+
+[[7,10,2,[[4,1,2,0],[5,8,2,7,5],[1,7,3,1]],[[10],7,5,8,1]],[[1]],[[10],6],[9],[10,[[8],[9,8],10,[2,9,8,0,10]],[3,0,6]]]
+[[[[6,10],[2,8,7,6,2]],3,[1,6,4,[8,10,0,2,5]],[4,6,4],[[2],2,[2],[0,4,5,0,10]]],[[[],[9],[6,6,3,1,10],1]]]
+
+[[[5],5,6,8],[[0,[1,8,9],4,[9,3,3,2],[4,7]]],[7,[[8,8,4,7,6]]]]
+[[10,6,[2,1,8,0,7],4],[[]]]
+
+[[],[1,[3,[10,8,0,6]],3,[10,3,5,[10,6,1]]],[1,[[8,3,5,1],0,1,0],[[],[1,4,0]],[[5,5,5,10],[],[1],[],10]],[[[0],[],8,4,[0]],[3,9],5,10]]
+[[0],[3,[6],[[10,4,6],[4,5]],3,[]],[[],2],[9],[]]
+
+[[8]]
+[]
+
+[[3,[6,[3],1,8],8,10,10],[2,[3,0,[1,8,2]]]]
+[[5],[9,[2,[5,3,8,8,3]]],[[[6,3],[4,2,1,6],[0],9],[4],[[9],5,7,5,9],3,6]]
+
+[[10,8,[[]],[[9,10],10,[10,7,10,3]]]]
+[[[]],[0],[]]
+
+[[[[8,5],2,0,5,[2,8,10,10]],[8],5,4],[4,9,10],[2,[[9,6],[6,10,2]],[[4,4,5,4]],2,0],[[9,[7,3,6],1,[]],[[5,3,3,5,5],8],[[5,4],[],[6,1]],[],[10,2,[],[]]]]
+[[4],[[10],[]]]
+
+[[[[10,7,4,5]],9,4],[[[3]],[2,2],[4],[[],4,[10,7],4],[5,5,[9,10,4,3],0]],[8],[[[6,0,3],[8,2,10,0,2],[8,2,10]],9,2,9,2],[[8],2,[9,[3,2,8,7,3],10],[[9,7],4,[3,5,6],6,7],[[9,9,6],[]]]]
+[[[[3,7],[5,1,2,8],4,0]]]
+
+[[8,[[8,4,8,5]],6,[[]],[6,[]]],[4,[1,[4,8,9],[]]],[[],10,[6,[],[7,3,7],[]],3],[[]]]
+[[[[5],[],8]],[10,4,1]]
+
+[[10,[4,7],[9,[],2,7],9,10],[2,3,4],[1,[1,3,[2,4],10],[[1,6,7,4,4],5,4,8],5]]
+[[2,9]]
+
+[[[[7,7,8,3,5],0,10,10],[1,7,[6,4,6,0,7],[9]],[],2],[],[[],2,[9,[9,10],9,[6],[5,7,7,6]]],[[],4,5]]
+[[3,2,8,[2,4,[7,6],[3,5]],4]]
+
+[[3,8,10,[[7]]],[3],[]]
+[[5],[8]]
+
+[[[[7,10,9,1],3]],[[[6,6,10],[]],3],[4,5,[[]]],[[],[],[[5,3],[4,6,6],[6,3,6]]]]
+[[[[9,3,8,5,6],2,[8],2]],[[],4],[[6,[2,10,1],7,6]]]
+
+[[4,6]]
+[[5,[],7,9,8]]
+
+[[5,[],2],[4,[0,[9,10],[3,3,5,10],[4,5,0,0],[9,8,3,7]]],[[[10],[5,2,6],[1,9,2,3,5],[6,8,10,9,8],8],0,4],[1,1,[2,1,2,[2,4,8,1],[1,8,4]],[7,[2,0],4,[9,10,2]],7],[4,6,[[8,5],7,8,8],[1]]]
+[[[],3,8,10,[[]]],[[[9,2,10,10]],[6,[0,3],[5],9,[2]],[6,3,6,9],[]],[[[7,8,7,7],[4],9,1,3],10,[8,7],5,0],[],[[[7,0,2,1,6],4],10]]
+
+[[],[[2,8,3,3,10],[[7,4,10,8],10,[5,9]],[[2],7,9,1],[[],[7,8],[10],[8]],[]],[[[],[],[9,9,4,6,10],[6,5,2],[]]]]
+[[],[[]],[[[4,6],[],[9,5,5]],3,[7,4,0],[8,8],[0,[4,4,3],[],9,4]],[[6,[9,6,1],[4]]]]
+
+[[[2,[],[8,4,8,7],3,[1]],3,6,2],[]]
+[[[],[[],1,6],0],[10,8,7,[[6,3],[3,7],4,10,8]]]
+
+[[],[1,10,5,[4,[0,9,1,1]],[[9,3,6,1],10,4,3,5]],[10,8,[5]],[1,[6]],[1,[[5,9],[],5,[]]]]
+[[]]
+
+[[[[1],6,[9,1,10],[7]],[[10,8,10,4,7],1]],[8,[7,1]],[[[2,3,10],4,8,2],[[5,10,0,6],[1,2,6,9],[]],[[],[3,10],[1,2,3],2],10],[]]
+[[5,[0,[7]],[],[[9]]],[],[10,[5,[7]],[[10,7,4,0]],1]]
+
+[[1],[[4,5,6,[]],[],[[7,7]],[10,[1,10],[0],7],6],[10],[[],[[7],6,[7,0,6,6,5],[4,2,8,4,7],[10]],8,2,10],[1,0,5,3]]
+[[8,[2,[6,8,7]],6,2,7],[1,2]]
+
+[[[[4,8,9,7,2],[],9,[6,9,10]]]]
+[[1,1],[],[0],[[[],[4,1,7],[1,8,3]],9,[7,[],[3,9,8]],2],[[]]]
+
+[[6],[7],[9,[0,[8,6]],[9]]]
+[[[[6],[],[2,10],0],[8,[4,10],[4,5,8,0,0]]],[3,1],[[10]]]
+
+[[9,[[4,0,7,6,1],3,4,[2,10,6,8,8],[2]]],[[],[],[[8,2,10,7,10],[10,8,1,0],1],[]]]
+[[4,2,4,3,6],[[7,[7,6,5,8,7],[0,4]]],[],[8,5,[3,[1,9,5],[2,8,8,8,3],4,7],7,5]]
+
+[[[3,9,[7,10,2,1]],[]],[[6],2,6],[10],[],[[],6]]
+[[[[10,2]],2,[[8,6,0,8]],3],[8,7],[]]
+
+[[],[3,9,7,[10,5,[6],[]]],[[[2],[3,3,3,2],[4,5,0],[]],[],4,2]]
+[[[1,9,8,[5,7]],0,4],[[5,[0,6,4,6,4],6,[4,1,5,3,4]],0,[[7,0,0,9],[9,5,4,1]],[]],[[8,9,6,0,3],[],[0,[]],[]],[[[],[1,4,4]],8,[6]]]
+
+[[[],4,[[10],6,0,3],[[7,5,1,2],[],3,1]],[2,[],2],[2,[7,[8,7,4,8],2,10],[],4],[9,[[4,4,5,9],0,4,7,6],[[]],[8],10]]
+[[9,0,[[],1,3,2],[3,[],[1,4,0,2],5,8]],[],[[1,2,0,2,0],[[]],[[0]],8,7]]

day13/src/main.rs

@@ -1,3 +1,138 @@
-fn main() {
-    println!("Hello, world!");
+use std::{cmp::Ordering, fs::read_to_string, str::Lines};
+
+#[derive(Debug, Clone, Eq)]
+enum Node {
+    Number(i32),
+    List(Vec<Node>),
+}
+
+impl PartialEq for Node {
+    fn eq(&self, other: &Self) -> bool {
+        self.partial_cmp(other) == Some(Ordering::Equal)
+    }
+}
+
+impl Ord for Node {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(other).unwrap()
+    }
+}
+
+impl PartialOrd for Node {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        match (self, other) {
+            (Self::Number(n1), Self::Number(n2)) => n1.partial_cmp(n2),
+            (Self::Number(n), Self::List(_)) => {
+                Self::List(vec![Self::Number(*n)]).partial_cmp(other)
+            }
+            (Self::List(_), Self::Number(n)) => {
+                self.partial_cmp(&Self::List(vec![Self::Number(*n)]))
+            }
+            (Self::List(l1), Self::List(l2)) => {
+                for i in 0..l1.len().min(l2.len()) {
+                    let n1 = &l1[i];
+                    let n2 = &l2[i];
+                    match n1.partial_cmp(&n2) {
+                        None | Some(Ordering::Equal) => (),
+                        ord => return ord,
+                    }
+                }
+                Some(l1.len().cmp(&l2.len()))
+            }
+        }
+    }
+}
+
+impl From<&str> for Node {
+    fn from(line: &str) -> Self {
+        match line.split_once('[') {
+            None => Self::Number(line.parse().unwrap()),
+            Some(("", "]")) => Self::List(vec![]),
+            Some(("", r)) => match r.rsplit_once(']') {
+                Some((r, "")) => {
+                    let mut indentation = 0;
+                    Self::List(
+                        r.split(|c| match c {
+                            '[' => {
+                                indentation += 1;
+                                false
+                            }
+                            ']' => {
+                                indentation -= 1;
+                                false
+                            }
+                            ',' if indentation == 0 => true,
+                            _ => false,
+                        })
+                        .map(Into::into)
+                        .collect(),
+                    )
+                }
+                _ => panic!("missing closing parenthesis"),
+            },
+            _ => panic!("invalid input"),
+        }
+    }
+}
+
+fn parse_pair(lines: &mut Lines) -> Option<(Node, Node)> {
+    let [first, second] = &lines
+        .take_while(|line| !line.is_empty())
+        .map(Node::from)
+        .collect::<Vec<_>>()[..] else {return None;};
+    Some((first.clone(), second.clone()))
+}
+
+fn main() {
+    let input = "[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]"
+        .to_owned();
+    let input = read_to_string("input.txt").unwrap_or(input);
+    let mut input = input.lines();
+    let mut pairs = vec![];
+    while let Some(pair) = parse_pair(&mut input) {
+        pairs.push(pair);
+    }
+    let correct: usize = pairs
+        .iter()
+        .enumerate()
+        .filter_map(|(i, pair)| if pair.0 < pair.1 { Some(i + 1) } else { None })
+        .sum();
+    println!("{correct}");
+    let mut packets: Vec<_> = pairs.into_iter().flat_map(|p| [p.0, p.1]).collect();
+    packets.push("[[2]]".into());
+    packets.push("[[6]]".into());
+    packets.sort();
+    let decoder_key = (packets
+        .iter()
+        .position(|e| *e == Node::from("[[2]]"))
+        .unwrap()
+        + 1)
+        * (packets
+            .iter()
+            .position(|e| *e == Node::from("[[6]]"))
+            .unwrap()
+            + 1);
+    println!("{decoder_key}");
 }

day14/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day14"
+version = "0.1.0"

day14/input.txt

@@ -0,0 +1,164 @@
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+520,87 -> 524,87
+480,121 -> 480,122 -> 498,122 -> 498,121
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+493,24 -> 498,24
+496,22 -> 501,22
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+508,79 -> 512,79
+486,104 -> 486,105 -> 493,105 -> 493,104
+497,129 -> 502,129
+474,34 -> 478,34
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+508,87 -> 512,87
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+499,20 -> 504,20
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+496,125 -> 501,125
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+511,26 -> 516,26
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+502,83 -> 506,83
+496,87 -> 500,87
+483,26 -> 488,26
+487,131 -> 492,131
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+499,85 -> 503,85
+480,34 -> 484,34
+474,38 -> 478,38
+486,104 -> 486,105 -> 493,105 -> 493,104
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+480,38 -> 484,38
+489,40 -> 493,40
+483,36 -> 487,36
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+508,131 -> 513,131
+517,85 -> 521,85
+494,131 -> 499,131
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+514,87 -> 518,87
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+507,24 -> 512,24
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+471,40 -> 475,40
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+511,81 -> 515,81
+514,83 -> 518,83
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+465,40 -> 469,40
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+480,29 -> 490,29 -> 490,28
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+493,127 -> 498,127
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+504,26 -> 509,26
+492,20 -> 497,20
+477,36 -> 481,36
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+505,81 -> 509,81
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+480,121 -> 480,122 -> 498,122 -> 498,121
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+490,26 -> 495,26
+504,129 -> 509,129
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+503,22 -> 508,22
+495,18 -> 500,18
+490,129 -> 495,129
+477,40 -> 481,40
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+511,85 -> 515,85
+502,87 -> 506,87
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+500,127 -> 505,127
+489,22 -> 494,22
+499,14 -> 499,15 -> 508,15
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+483,40 -> 487,40
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+497,26 -> 502,26
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+501,131 -> 506,131
+468,38 -> 472,38
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+486,24 -> 491,24
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+471,36 -> 475,36
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+486,38 -> 490,38
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+508,83 -> 512,83
+512,53 -> 512,43 -> 512,53 -> 514,53 -> 514,48 -> 514,53 -> 516,53 -> 516,44 -> 516,53 -> 518,53 -> 518,50 -> 518,53 -> 520,53 -> 520,46 -> 520,53
+486,104 -> 486,105 -> 493,105 -> 493,104
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+480,29 -> 490,29 -> 490,28
+484,147 -> 484,149 -> 483,149 -> 483,153 -> 489,153 -> 489,149 -> 488,149 -> 488,147
+480,121 -> 480,122 -> 498,122 -> 498,121
+500,24 -> 505,24
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+480,118 -> 480,111 -> 480,118 -> 482,118 -> 482,116 -> 482,118 -> 484,118 -> 484,111 -> 484,118 -> 486,118 -> 486,110 -> 486,118 -> 488,118 -> 488,117 -> 488,118
+475,166 -> 475,159 -> 475,166 -> 477,166 -> 477,156 -> 477,166 -> 479,166 -> 479,165 -> 479,166 -> 481,166 -> 481,156 -> 481,166 -> 483,166 -> 483,163 -> 483,166 -> 485,166 -> 485,156 -> 485,166 -> 487,166 -> 487,159 -> 487,166
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+499,14 -> 499,15 -> 508,15
+513,69 -> 513,71 -> 511,71 -> 511,76 -> 522,76 -> 522,71 -> 517,71 -> 517,69
+494,90 -> 494,92 -> 489,92 -> 489,100 -> 504,100 -> 504,92 -> 497,92 -> 497,90
+477,32 -> 481,32
+471,144 -> 471,134 -> 471,144 -> 473,144 -> 473,140 -> 473,144 -> 475,144 -> 475,143 -> 475,144 -> 477,144 -> 477,142 -> 477,144 -> 479,144 -> 479,137 -> 479,144 -> 481,144 -> 481,134 -> 481,144 -> 483,144 -> 483,136 -> 483,144 -> 485,144 -> 485,134 -> 485,144
+505,85 -> 509,85
+520,56 -> 520,60 -> 517,60 -> 517,66 -> 528,66 -> 528,60 -> 523,60 -> 523,56

day14/src/main.rs

@@ -1,3 +1,191 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::read_to_string;
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+struct Map {
+    min_x: usize,
+    width: usize,
+    height: usize,
+    map: Vec<bool>,
+}
+
+impl Map {
+    fn new() -> Self {
+        Self {
+            min_x: 500,
+            width: 0,
+            height: 0,
+            map: vec![],
+        }
+    }
+
+    fn print(&self) {
+        for y in 0..self.height {
+            for x in 0..self.width {
+                print!(
+                    "{}",
+                    if self.map[x + y * self.width] {
+                        '#'
+                    } else {
+                        '.'
+                    }
+                );
+            }
+            println!();
+        }
+    }
+
+    fn at(&self, position: (usize, usize)) -> bool {
+        if !self.is_inside(position) {
+            return false;
+        }
+        let x = position.0 - self.min_x;
+        self.map[x + position.1 * self.width]
+    }
+
+    fn is_inside(&self, position: (usize, usize)) -> bool {
+        position.0 >= self.min_x && position.0 < self.min_x + self.width && position.1 < self.height
+    }
+
+    fn add_obstacle(&mut self, position: (usize, usize)) {
+        while self.min_x > position.0 {
+            self.extend_left();
+        }
+        while self.min_x + self.width <= position.0 {
+            self.extend_right();
+        }
+        while self.height <= position.1 {
+            self.extend_down();
+        }
+        let x = position.0 - self.min_x;
+        self.map[x + position.1 * self.width] = true;
+    }
+
+    fn extend_down(&mut self) {
+        self.map.append(&mut vec![false; self.width]);
+        self.height += 1;
+    }
+
+    fn extend_left(&mut self) {
+        self.map.append(&mut vec![false; self.height]);
+        for y in (0..self.height).rev() {
+            for x in (0..self.width).rev() {
+                self.map[(x + 1) + y * (self.width + 1)] = self.map[x + y * self.width];
+            }
+        }
+        self.width += 1;
+        self.min_x -= 1;
+        for y in 0..self.height {
+            self.map[y * self.width] = false;
+        }
+    }
+
+    fn extend_right(&mut self) {
+        self.map.append(&mut vec![false; self.height]);
+        for y in (0..self.height).rev() {
+            for x in (0..self.width).rev() {
+                self.map[x + y * (self.width + 1)] = self.map[x + y * self.width];
+            }
+        }
+        self.width += 1;
+        for y in 0..self.height {
+            self.map[self.width - 1 + y * self.width] = false;
+        }
+    }
+}
+
+fn add_sand(map: &Map) -> Option<(usize, usize)> {
+    let mut sand = (500, 0);
+    while map.is_inside(sand) {
+        let x = sand.0;
+        let y = sand.1;
+        if !map.at((x, y + 1)) {
+            sand.1 += 1;
+            continue;
+        }
+        if !map.at((x - 1, y + 1)) {
+            sand.1 += 1;
+            sand.0 -= 1;
+            continue;
+        }
+        if !map.at((x + 1, y + 1)) {
+            sand.1 += 1;
+            sand.0 += 1;
+            continue;
+        }
+        return Some(sand);
+    }
+    None
+}
+
+fn add_sand_floor(map: &Map, floor: usize) -> Option<(usize, usize)> {
+    let mut sand = (500, 0);
+    while !map.at((500, 0)) {
+        let x = sand.0;
+        let y = sand.1;
+        if y + 1 == floor {
+            return Some(sand);
+        }
+        if !map.at((x, y + 1)) {
+            sand.1 += 1;
+            continue;
+        }
+        if !map.at((x - 1, y + 1)) {
+            sand.1 += 1;
+            sand.0 -= 1;
+            continue;
+        }
+        if !map.at((x + 1, y + 1)) {
+            sand.1 += 1;
+            sand.0 += 1;
+            continue;
+        }
+        return Some(sand);
+    }
+    None
+}
+
+fn main() {
+    let input = "498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9"
+        .to_owned();
+    let input = read_to_string("input.txt").unwrap_or(input);
+    let mut map = Map::new();
+    for line in input.lines() {
+        let points = line.split(" -> ").map(|coord| {
+            let [x, y] = coord.split(',').map(|n| n.parse::<usize>().unwrap()).collect::<Vec<_>>()[..] else {panic!()};
+            (x, y)
+        }).collect::<Vec<_>>();
+        for line in points.windows(2) {
+            let (x1, y1) = line[0];
+            let (x2, y2) = line[1];
+            let x_min = x1.min(x2);
+            let x_max = x1.max(x2);
+            let y_min = y1.min(y2);
+            let y_max = y1.max(y2);
+            for x in x_min..=x_max {
+                for y in y_min..=y_max {
+                    map.add_obstacle((x, y));
+                }
+            }
+        }
+    }
+    println!("printing map:");
+    map.print();
+    let mut num_sand = 0;
+    while let Some(sand) = add_sand(&map) {
+        map.add_obstacle(sand);
+        num_sand += 1;
+    }
+    println!();
+    map.print();
+    println!("needed {num_sand} sand particles");
+    let floor = map.height + 1;
+    println!("floor: {floor}");
+    while let Some(sand) = add_sand_floor(&map, floor) {
+        map.add_obstacle(sand);
+        num_sand += 1;
+    }
+    println!();
+    map.print();
+    println!("needed {num_sand} sand particles");
 }

day15/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day15"
+version = "0.1.0"

day15/input.txt

@@ -0,0 +1,32 @@
+Sensor at x=2832148, y=322979: closest beacon is at x=3015667, y=-141020
+Sensor at x=1449180, y=3883502: closest beacon is at x=2656952, y=4188971
+Sensor at x=2808169, y=1194666: closest beacon is at x=3015667, y=-141020
+Sensor at x=1863363, y=2435968: closest beacon is at x=2166084, y=2883057
+Sensor at x=3558230, y=2190936: closest beacon is at x=3244164, y=2592191
+Sensor at x=711491, y=2444705: closest beacon is at x=617239, y=2988377
+Sensor at x=2727148, y=2766272: closest beacon is at x=2166084, y=2883057
+Sensor at x=2857938, y=3988086: closest beacon is at x=2968511, y=4098658
+Sensor at x=1242410, y=2270153: closest beacon is at x=214592, y=2000000
+Sensor at x=3171784, y=2523127: closest beacon is at x=3244164, y=2592191
+Sensor at x=2293378, y=71434: closest beacon is at x=3015667, y=-141020
+Sensor at x=399711, y=73420: closest beacon is at x=1152251, y=-158441
+Sensor at x=3677529, y=415283: closest beacon is at x=3015667, y=-141020
+Sensor at x=207809, y=2348497: closest beacon is at x=214592, y=2000000
+Sensor at x=60607, y=3403420: closest beacon is at x=617239, y=2988377
+Sensor at x=3767729, y=3136725: closest beacon is at x=4171278, y=3348370
+Sensor at x=3899632, y=3998969: closest beacon is at x=4171278, y=3348370
+Sensor at x=394783, y=1541278: closest beacon is at x=214592, y=2000000
+Sensor at x=1193642, y=642631: closest beacon is at x=1152251, y=-158441
+Sensor at x=122867, y=2661904: closest beacon is at x=214592, y=2000000
+Sensor at x=551012, y=3787568: closest beacon is at x=617239, y=2988377
+Sensor at x=3175715, y=2975144: closest beacon is at x=3244164, y=2592191
+Sensor at x=402217, y=2812449: closest beacon is at x=617239, y=2988377
+Sensor at x=879648, y=1177329: closest beacon is at x=214592, y=2000000
+Sensor at x=1317218, y=2978309: closest beacon is at x=617239, y=2988377
+Sensor at x=3965126, y=1743931: closest beacon is at x=3244164, y=2592191
+Sensor at x=2304348, y=3140055: closest beacon is at x=2166084, y=2883057
+Sensor at x=3380135, y=3650709: closest beacon is at x=2968511, y=4098658
+Sensor at x=49224, y=1914296: closest beacon is at x=214592, y=2000000
+Sensor at x=3096228, y=2457233: closest beacon is at x=3244164, y=2592191
+Sensor at x=1415660, y=6715: closest beacon is at x=1152251, y=-158441
+Sensor at x=2616280, y=3548378: closest beacon is at x=2656952, y=4188971

day15/src/main.rs

@@ -1,3 +1,95 @@
-fn main() {
-    println!("Hello, world!");
+use std::{collections::HashSet, fs::read_to_string, io::Write, ops::RangeInclusive};
+
+struct Sensor {
+    x: i64,
+    y: i64,
+    x_beacon: i64,
+    y_beacon: i64,
+    distance: u64,
+}
+
+impl From<&str> for Sensor {
+    fn from(value: &str) -> Self {
+        let [x_sensor, y_sensor, x_beacon, y_beacon] = value
+            .chars()
+            .filter(|c| c.is_ascii_digit() || c.is_whitespace() || *c == '-')
+            .collect::<String>()
+            .split_whitespace()
+            .map(|n| n.parse::<i64>().unwrap())
+            .collect::<Vec<_>>()[..] else {panic!()};
+        Self {
+            x: x_sensor,
+            y: y_sensor,
+            x_beacon,
+            y_beacon,
+            distance: x_sensor.abs_diff(x_beacon) + y_sensor.abs_diff(y_beacon),
+        }
+    }
+}
+
+fn main() {
+    let input = (
+        "Sensor at x=2, y=18: closest beacon is at x=-2, y=15
+Sensor at x=9, y=16: closest beacon is at x=10, y=16
+Sensor at x=13, y=2: closest beacon is at x=15, y=3
+Sensor at x=12, y=14: closest beacon is at x=10, y=16
+Sensor at x=10, y=20: closest beacon is at x=10, y=16
+Sensor at x=14, y=17: closest beacon is at x=10, y=16
+Sensor at x=8, y=7: closest beacon is at x=2, y=10
+Sensor at x=2, y=0: closest beacon is at x=2, y=10
+Sensor at x=0, y=11: closest beacon is at x=2, y=10
+Sensor at x=20, y=14: closest beacon is at x=25, y=17
+Sensor at x=17, y=20: closest beacon is at x=21, y=22
+Sensor at x=16, y=7: closest beacon is at x=15, y=3
+Sensor at x=14, y=3: closest beacon is at x=15, y=3
+Sensor at x=20, y=1: closest beacon is at x=15, y=3"
+            .to_owned(),
+        10,
+        20,
+    );
+    let (input, line, xy_max): (_, i64, i64) = read_to_string("input.txt")
+        .map(|input| (input, 2_000_000, 4_000_000))
+        .unwrap_or(input);
+    let sensors = input.lines().map(Sensor::from).collect::<Vec<_>>();
+    let mut covered: HashSet<_> = sensors
+        .iter()
+        .flat_map(|s| {
+            let diff = line.abs_diff(s.y);
+            if diff > s.distance {
+                return RangeInclusive::new(1, 0);
+            }
+            let d = s.distance - diff;
+            (s.x - d as i64)..=(s.x + d as i64)
+        })
+        .collect();
+    for sensor in &sensors {
+        if sensor.y_beacon == line {
+            covered.remove(&sensor.x_beacon);
+        }
+    }
+    println!("{} positions can't contain a beacon", covered.len());
+    'outer: for y in 0..=xy_max {
+        let mut ranges = vec![];
+        for sensor in &sensors {
+            let diff = y.abs_diff(sensor.y);
+            if diff > sensor.distance {
+                continue;
+            }
+            let d = sensor.distance - diff;
+            ranges.push((sensor.x - d as i64)..=(sensor.x + d as i64));
+        }
+        ranges.sort_unstable_by(|r1, r2| r1.start().cmp(r2.start()));
+        let mut max_x = 0;
+        for range in ranges {
+            if max_x + 1 < *range.start() {
+                let x = max_x + 1;
+                println!(
+                    "found beacon at {x},{y} with frequency {}",
+                    x * 4_000_000 + y
+                );
+                break 'outer;
+            }
+            max_x = max_x.max(*range.end());
+        }
+    }
 }

day2/src/main.rs

@@ -10,12 +10,9 @@ enum Symbol {
 impl From<char> for Symbol {
     fn from(value: char) -> Self {
         match value {
-            'A' => Self::Rock,
-            'B' => Self::Paper,
-            'C' => Self::Scissors,
-            'X' => Self::Rock,
-            'Y' => Self::Paper,
-            'Z' => Self::Scissors,
+            'A' | 'X' => Self::Rock,
+            'B' | 'Y' => Self::Paper,
+            'C' | 'Z' => Self::Scissors,
             _ => panic!("invalid input"),
         }
     }

day3/src/main.rs

@@ -3,12 +3,12 @@ use std::{collections::HashSet, fs::read_to_string};
 use color_eyre::{eyre::*, Result};
 use itertools::Itertools;
 
-fn priority(item: &char) -> usize {
+fn priority(item: char) -> Result<usize> {
     ('a'..='z')
-        .position(|c| *item == c)
+        .position(|c| item == c)
         .map(|i| i + 1)
-        .or_else(|| ('A'..='Z').position(|c| *item == c).map(|i| i + 27))
-        .unwrap_or(0)
+        .or_else(|| ('A'..='Z').position(|c| item == c).map(|i| i + 27))
+        .ok_or_else(|| eyre!("invalid character '{}'", item))
 }
 
 fn initial(input: &str) -> (usize, usize) {
@@ -20,7 +20,7 @@ fn initial(input: &str) -> (usize, usize) {
             let compartment2 = compartment2.chars().collect::<HashSet<_>>();
             compartment1
                 .intersection(&compartment2)
-                .map(priority)
+                .filter_map(|v| priority(*v).ok())
                 .sum::<usize>()
         })
         .sum();
@@ -32,7 +32,7 @@ fn initial(input: &str) -> (usize, usize) {
             group
                 .map(|line| line.chars().collect::<HashSet<_>>())
                 .coalesce(|a, b| Ok(a.intersection(&b).copied().collect()))
-                .map(|set| set.iter().map(priority).sum::<usize>())
+                .map(|set| set.iter().filter_map(|v| priority(*v).ok()).sum::<usize>())
                 .sum::<usize>()
         })
         .sum();

day4/Cargo.lock

@@ -0,0 +1,243 @@
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+# It is not intended for manual editing.
+version = 3
+
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+ "gimli",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
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+ "backtrace",
+ "color-spantrace",
+ "eyre",
+ "indenter",
+ "once_cell",
+ "owo-colors",
+ "tracing-error",
+]
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+ "once_cell",
+ "valuable",
+]
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+ "tracing",
+ "tracing-subscriber",
+]
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+name = "tracing-subscriber"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "sharded-slab",
+ "thread_local",
+ "tracing-core",
+]
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day4/Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+color-eyre = "0.6.2"
+itertools = "0.10.5"

day4/src/main.rs

@@ -1,3 +1,52 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs::read_to_string;
+
+use color_eyre::Result;
+use itertools::Itertools;
+
+fn initial(input: &str) -> (usize, usize) {
+    let ranges = input.lines().map(|line| {
+        line.split_terminator(',')
+            .map(|range| {
+                let (lower, upper): (usize, usize) = range
+                    .split_terminator('-')
+                    .map(|number| number.parse::<usize>().unwrap())
+                    .take(2)
+                    .collect_tuple()
+                    .unwrap();
+                lower..=upper
+            })
+            .take(2)
+            .collect_tuple()
+            .unwrap()
+    });
+    let containing = *ranges
+        .clone()
+        .map(|(first, second)| {
+            first.contains(second.start()) && first.contains(second.end())
+                || second.contains(first.start()) && second.contains(first.end())
+        })
+        .counts()
+        .get(&true)
+        .unwrap_or(&0usize);
+    let overlaping = *ranges
+        .map(|(first, second)| {
+            first.contains(second.start())
+                || first.contains(second.end())
+                || second.contains(first.start())
+                || second.contains(first.end())
+        })
+        .counts()
+        .get(&true)
+        .unwrap_or(&0usize);
+    (containing, overlaping)
+}
+
+fn main() -> Result<()> {
+    let input = read_to_string("input.txt")?;
+    let (containing, overlaping) = initial(&input);
+    println!(
+        "{} pairs have containing ranges, {} ranges overlap",
+        containing, overlaping
+    );
+    Ok(())
 }

day5/Cargo.lock

@@ -0,0 +1,243 @@
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+# It is not intended for manual editing.
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+
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+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
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+name = "pin-project-lite"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
+
+[[package]]
+name = "sharded-slab"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "900fba806f70c630b0a382d0d825e17a0f19fcd059a2ade1ff237bcddf446b31"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5516c27b78311c50bf42c071425c560ac799b11c30b31f87e3081965fe5e0180"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "tracing"
+version = "0.1.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
+dependencies = [
+ "cfg-if",
+ "pin-project-lite",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24eb03ba0eab1fd845050058ce5e616558e8f8d8fca633e6b163fe25c797213a"
+dependencies = [
+ "once_cell",
+ "valuable",
+]
+
+[[package]]
+name = "tracing-error"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d686ec1c0f384b1277f097b2f279a2ecc11afe8c133c1aabf036a27cb4cd206e"
+dependencies = [
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6176eae26dd70d0c919749377897b54a9276bd7061339665dd68777926b5a70"
+dependencies = [
+ "sharded-slab",
+ "thread_local",
+ "tracing-core",
+]
+
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"

day5/Cargo.toml

@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+color-eyre = "0.6.2"
+itertools = "0.10.5"

day5/input.txt

@@ -0,0 +1,511 @@
+    [G]         [P]         [M]    
+    [V]     [M] [W] [S]     [Q]    
+    [N]     [N] [G] [H]     [T] [F]
+    [J]     [W] [V] [Q] [W] [F] [P]
+[C] [H]     [T] [T] [G] [B] [Z] [B]
+[S] [W] [S] [L] [F] [B] [P] [C] [H]
+[G] [M] [Q] [S] [Z] [T] [J] [D] [S]
+[B] [T] [M] [B] [J] [C] [T] [G] [N]
+ 1   2   3   4   5   6   7   8   9 
+
+move 2 from 4 to 2
+move 6 from 9 to 7
+move 4 from 7 to 2
+move 2 from 4 to 1
+move 2 from 6 to 7
+move 1 from 3 to 8
+move 4 from 7 to 1
+move 2 from 3 to 2
+move 3 from 8 to 5
+move 3 from 1 to 4
+move 12 from 2 to 5
+move 2 from 6 to 8
+move 12 from 5 to 8
+move 3 from 7 to 9
+move 18 from 8 to 9
+move 2 from 8 to 6
+move 3 from 2 to 3
+move 14 from 9 to 4
+move 1 from 1 to 3
+move 7 from 9 to 3
+move 1 from 2 to 1
+move 8 from 4 to 5
+move 5 from 6 to 3
+move 2 from 7 to 9
+move 3 from 4 to 9
+move 4 from 9 to 6
+move 4 from 6 to 1
+move 8 from 4 to 6
+move 10 from 1 to 2
+move 13 from 3 to 2
+move 17 from 5 to 9
+move 2 from 5 to 1
+move 9 from 9 to 7
+move 1 from 3 to 6
+move 2 from 1 to 8
+move 11 from 2 to 4
+move 5 from 6 to 8
+move 1 from 6 to 3
+move 1 from 1 to 4
+move 3 from 8 to 6
+move 3 from 2 to 8
+move 9 from 7 to 9
+move 4 from 4 to 7
+move 1 from 9 to 5
+move 15 from 9 to 7
+move 7 from 8 to 3
+move 1 from 5 to 6
+move 2 from 6 to 9
+move 8 from 2 to 6
+move 3 from 4 to 3
+move 1 from 2 to 5
+move 4 from 9 to 3
+move 1 from 3 to 4
+move 13 from 6 to 2
+move 1 from 5 to 1
+move 4 from 4 to 9
+move 6 from 3 to 2
+move 11 from 2 to 7
+move 6 from 3 to 4
+move 3 from 3 to 2
+move 1 from 3 to 4
+move 1 from 1 to 3
+move 3 from 9 to 2
+move 1 from 3 to 1
+move 4 from 7 to 1
+move 1 from 9 to 5
+move 5 from 1 to 4
+move 11 from 2 to 4
+move 1 from 5 to 3
+move 1 from 2 to 3
+move 12 from 4 to 2
+move 2 from 7 to 2
+move 7 from 4 to 3
+move 5 from 4 to 1
+move 7 from 7 to 6
+move 4 from 1 to 8
+move 1 from 8 to 5
+move 8 from 3 to 2
+move 4 from 7 to 4
+move 13 from 7 to 1
+move 2 from 8 to 6
+move 5 from 4 to 9
+move 1 from 3 to 6
+move 1 from 5 to 8
+move 1 from 2 to 9
+move 4 from 2 to 6
+move 2 from 8 to 6
+move 10 from 1 to 3
+move 4 from 9 to 4
+move 2 from 1 to 3
+move 5 from 2 to 9
+move 4 from 9 to 2
+move 1 from 1 to 2
+move 13 from 2 to 4
+move 15 from 4 to 5
+move 3 from 6 to 8
+move 8 from 3 to 8
+move 1 from 4 to 2
+move 14 from 5 to 1
+move 1 from 5 to 4
+move 1 from 4 to 2
+move 8 from 6 to 7
+move 3 from 6 to 2
+move 2 from 9 to 1
+move 8 from 8 to 7
+move 9 from 1 to 5
+move 7 from 5 to 3
+move 14 from 7 to 9
+move 2 from 2 to 3
+move 7 from 2 to 1
+move 1 from 6 to 1
+move 4 from 9 to 2
+move 8 from 3 to 6
+move 2 from 4 to 3
+move 4 from 3 to 5
+move 5 from 5 to 7
+move 2 from 6 to 9
+move 6 from 6 to 2
+move 4 from 2 to 3
+move 1 from 6 to 2
+move 2 from 7 to 8
+move 13 from 9 to 5
+move 2 from 7 to 1
+move 14 from 1 to 5
+move 15 from 5 to 7
+move 3 from 8 to 7
+move 5 from 3 to 5
+move 6 from 5 to 7
+move 4 from 1 to 7
+move 1 from 2 to 5
+move 3 from 2 to 8
+move 11 from 5 to 2
+move 10 from 7 to 1
+move 1 from 3 to 4
+move 10 from 2 to 9
+move 1 from 5 to 8
+move 6 from 7 to 3
+move 1 from 4 to 6
+move 2 from 3 to 8
+move 1 from 2 to 1
+move 4 from 3 to 9
+move 3 from 1 to 6
+move 2 from 7 to 1
+move 1 from 5 to 6
+move 1 from 3 to 8
+move 4 from 1 to 4
+move 5 from 2 to 9
+move 3 from 1 to 4
+move 18 from 9 to 7
+move 4 from 8 to 4
+move 3 from 1 to 2
+move 1 from 9 to 7
+move 1 from 4 to 7
+move 1 from 6 to 2
+move 1 from 2 to 5
+move 25 from 7 to 3
+move 7 from 4 to 2
+move 8 from 7 to 9
+move 4 from 8 to 6
+move 1 from 8 to 5
+move 4 from 6 to 5
+move 2 from 9 to 5
+move 3 from 5 to 8
+move 4 from 6 to 4
+move 12 from 3 to 5
+move 11 from 3 to 2
+move 13 from 5 to 8
+move 4 from 9 to 6
+move 7 from 4 to 9
+move 2 from 6 to 2
+move 12 from 2 to 7
+move 1 from 6 to 3
+move 1 from 5 to 6
+move 2 from 5 to 3
+move 15 from 8 to 6
+move 4 from 6 to 7
+move 1 from 5 to 1
+move 10 from 2 to 8
+move 8 from 8 to 3
+move 8 from 6 to 8
+move 2 from 7 to 6
+move 9 from 9 to 7
+move 8 from 8 to 9
+move 1 from 1 to 3
+move 1 from 2 to 7
+move 7 from 3 to 1
+move 3 from 8 to 5
+move 3 from 1 to 6
+move 7 from 9 to 2
+move 2 from 3 to 7
+move 5 from 7 to 9
+move 17 from 7 to 5
+move 2 from 7 to 6
+move 10 from 6 to 3
+move 1 from 1 to 3
+move 6 from 9 to 3
+move 1 from 2 to 9
+move 2 from 7 to 9
+move 2 from 9 to 7
+move 1 from 5 to 8
+move 1 from 8 to 5
+move 6 from 2 to 5
+move 1 from 6 to 1
+move 5 from 3 to 5
+move 1 from 6 to 8
+move 1 from 7 to 9
+move 2 from 9 to 3
+move 15 from 5 to 2
+move 2 from 1 to 8
+move 2 from 3 to 7
+move 2 from 8 to 3
+move 3 from 5 to 9
+move 1 from 8 to 6
+move 1 from 9 to 6
+move 3 from 7 to 6
+move 17 from 3 to 4
+move 1 from 1 to 2
+move 6 from 2 to 9
+move 16 from 4 to 1
+move 4 from 6 to 8
+move 9 from 5 to 6
+move 8 from 6 to 2
+move 2 from 9 to 5
+move 2 from 3 to 5
+move 1 from 6 to 2
+move 1 from 4 to 8
+move 14 from 1 to 3
+move 8 from 5 to 3
+move 20 from 3 to 1
+move 1 from 8 to 2
+move 1 from 9 to 6
+move 1 from 6 to 7
+move 1 from 7 to 3
+move 22 from 1 to 2
+move 3 from 3 to 6
+move 27 from 2 to 8
+move 2 from 2 to 8
+move 2 from 6 to 9
+move 2 from 9 to 4
+move 2 from 4 to 8
+move 1 from 1 to 3
+move 14 from 8 to 5
+move 1 from 3 to 9
+move 3 from 9 to 2
+move 5 from 2 to 8
+move 10 from 2 to 9
+move 1 from 6 to 7
+move 1 from 7 to 5
+move 7 from 5 to 2
+move 2 from 9 to 2
+move 1 from 6 to 2
+move 2 from 9 to 5
+move 3 from 5 to 6
+move 6 from 5 to 3
+move 1 from 5 to 6
+move 4 from 3 to 9
+move 2 from 9 to 8
+move 3 from 9 to 5
+move 23 from 8 to 1
+move 2 from 6 to 1
+move 1 from 5 to 7
+move 2 from 3 to 5
+move 2 from 9 to 5
+move 4 from 9 to 7
+move 2 from 9 to 4
+move 1 from 5 to 4
+move 5 from 8 to 5
+move 2 from 6 to 2
+move 3 from 7 to 3
+move 1 from 3 to 4
+move 3 from 2 to 8
+move 4 from 1 to 6
+move 2 from 6 to 3
+move 4 from 1 to 2
+move 3 from 8 to 1
+move 13 from 2 to 5
+move 4 from 3 to 2
+move 14 from 5 to 7
+move 5 from 2 to 7
+move 18 from 7 to 9
+move 4 from 4 to 7
+move 2 from 5 to 4
+move 17 from 9 to 5
+move 1 from 9 to 1
+move 1 from 7 to 2
+move 5 from 7 to 2
+move 18 from 1 to 4
+move 1 from 7 to 3
+move 1 from 3 to 6
+move 2 from 1 to 3
+move 1 from 6 to 5
+move 2 from 6 to 8
+move 1 from 8 to 9
+move 1 from 8 to 3
+move 13 from 4 to 5
+move 1 from 1 to 6
+move 3 from 2 to 4
+move 1 from 6 to 1
+move 3 from 2 to 9
+move 3 from 3 to 1
+move 5 from 4 to 5
+move 30 from 5 to 3
+move 1 from 4 to 6
+move 1 from 9 to 8
+move 1 from 9 to 6
+move 21 from 3 to 7
+move 3 from 1 to 6
+move 1 from 1 to 4
+move 1 from 9 to 6
+move 1 from 8 to 2
+move 1 from 3 to 6
+move 1 from 9 to 3
+move 5 from 4 to 8
+move 1 from 2 to 4
+move 9 from 5 to 7
+move 2 from 5 to 9
+move 2 from 8 to 2
+move 2 from 6 to 3
+move 1 from 4 to 1
+move 4 from 3 to 8
+move 2 from 9 to 2
+move 4 from 2 to 6
+move 1 from 1 to 4
+move 2 from 6 to 9
+move 2 from 5 to 4
+move 1 from 3 to 1
+move 1 from 1 to 3
+move 2 from 9 to 1
+move 5 from 3 to 5
+move 1 from 1 to 8
+move 4 from 6 to 4
+move 5 from 5 to 6
+move 18 from 7 to 5
+move 1 from 3 to 4
+move 12 from 7 to 5
+move 15 from 5 to 6
+move 1 from 5 to 8
+move 1 from 3 to 7
+move 1 from 1 to 2
+move 1 from 2 to 4
+move 1 from 7 to 9
+move 2 from 8 to 2
+move 1 from 2 to 4
+move 4 from 4 to 2
+move 1 from 2 to 1
+move 1 from 9 to 8
+move 4 from 6 to 4
+move 3 from 2 to 6
+move 1 from 2 to 6
+move 8 from 4 to 3
+move 1 from 1 to 3
+move 6 from 6 to 1
+move 1 from 3 to 6
+move 5 from 1 to 7
+move 10 from 5 to 9
+move 3 from 9 to 8
+move 7 from 6 to 2
+move 1 from 7 to 8
+move 3 from 5 to 8
+move 3 from 6 to 2
+move 6 from 8 to 9
+move 1 from 5 to 3
+move 2 from 3 to 1
+move 2 from 4 to 8
+move 6 from 6 to 9
+move 1 from 1 to 4
+move 17 from 9 to 2
+move 1 from 4 to 1
+move 2 from 7 to 8
+move 1 from 9 to 8
+move 3 from 8 to 4
+move 3 from 1 to 4
+move 9 from 8 to 2
+move 1 from 8 to 4
+move 12 from 2 to 7
+move 4 from 7 to 4
+move 1 from 8 to 1
+move 10 from 4 to 2
+move 3 from 3 to 2
+move 1 from 9 to 7
+move 11 from 7 to 3
+move 1 from 3 to 1
+move 2 from 3 to 9
+move 1 from 3 to 7
+move 2 from 1 to 9
+move 1 from 6 to 5
+move 7 from 3 to 6
+move 1 from 7 to 3
+move 3 from 3 to 4
+move 1 from 5 to 7
+move 2 from 4 to 3
+move 2 from 4 to 8
+move 1 from 7 to 6
+move 2 from 6 to 8
+move 1 from 9 to 2
+move 1 from 9 to 5
+move 1 from 5 to 1
+move 1 from 8 to 6
+move 1 from 3 to 2
+move 4 from 6 to 1
+move 5 from 1 to 4
+move 11 from 2 to 4
+move 2 from 8 to 2
+move 1 from 8 to 9
+move 27 from 2 to 5
+move 4 from 6 to 3
+move 3 from 2 to 4
+move 2 from 5 to 9
+move 1 from 5 to 7
+move 2 from 9 to 5
+move 14 from 4 to 7
+move 2 from 4 to 7
+move 3 from 4 to 8
+move 4 from 3 to 1
+move 4 from 1 to 8
+move 2 from 3 to 9
+move 2 from 9 to 3
+move 7 from 8 to 9
+move 1 from 3 to 8
+move 2 from 3 to 2
+move 25 from 5 to 9
+move 1 from 5 to 8
+move 1 from 8 to 7
+move 26 from 9 to 1
+move 23 from 1 to 5
+move 7 from 9 to 7
+move 1 from 9 to 8
+move 1 from 9 to 2
+move 5 from 7 to 1
+move 20 from 5 to 6
+move 1 from 7 to 6
+move 2 from 5 to 3
+move 1 from 8 to 6
+move 21 from 6 to 8
+move 1 from 6 to 4
+move 1 from 1 to 7
+move 2 from 1 to 6
+move 1 from 1 to 3
+move 1 from 2 to 5
+move 1 from 2 to 6
+move 2 from 7 to 6
+move 6 from 7 to 9
+move 3 from 1 to 2
+move 17 from 8 to 1
+move 1 from 4 to 1
+move 2 from 6 to 9
+move 3 from 8 to 9
+move 2 from 3 to 7
+move 2 from 9 to 8
+move 4 from 7 to 3
+move 4 from 3 to 4
+move 2 from 5 to 8
+move 4 from 8 to 4
+move 3 from 6 to 8
+move 18 from 1 to 5
+move 1 from 3 to 4
+move 3 from 2 to 4
+move 5 from 9 to 1
+move 10 from 7 to 5
+move 5 from 1 to 3
+move 5 from 3 to 5
+move 5 from 4 to 3
+move 2 from 4 to 2
+move 5 from 8 to 3
+move 25 from 5 to 2
+move 3 from 3 to 6
+move 1 from 1 to 3
+move 3 from 6 to 7
+move 1 from 4 to 2
+move 1 from 5 to 8
+move 2 from 4 to 9
+move 1 from 8 to 1
+move 20 from 2 to 7
+move 10 from 7 to 1
+move 1 from 1 to 7
+move 4 from 7 to 8
+move 5 from 5 to 4
+move 4 from 8 to 6
+move 1 from 1 to 3
+move 5 from 7 to 4
+move 2 from 1 to 5
+move 4 from 9 to 1
+move 3 from 2 to 5
+move 5 from 5 to 1
+move 1 from 9 to 1
+move 11 from 1 to 3
+move 1 from 6 to 2
+move 7 from 3 to 5
+move 11 from 3 to 7
+move 1 from 2 to 6
+move 7 from 7 to 8
+move 1 from 9 to 1
+move 2 from 3 to 1
+move 1 from 5 to 3
+move 4 from 1 to 6
+move 4 from 6 to 3
+move 9 from 4 to 5
+move 2 from 8 to 2
+move 4 from 6 to 9
+move 3 from 2 to 4
+move 1 from 8 to 6

day5/src/main.rs

@@ -1,3 +1,99 @@
-fn main() {
-    println!("Hello, world!");
+use std::{fs::read_to_string, str::Lines};
+
+use color_eyre::Result;
+use itertools::Itertools;
+
+fn parse_stacks(input: &mut Lines) -> Vec<Vec<char>> {
+    let horizontal_stack = input
+        .map(|line| {
+            line.chars()
+                .skip(1)
+                .step_by(4)
+                .map(|c| if c.is_whitespace() { None } else { Some(c) })
+                .collect::<Vec<_>>()
+        })
+        .take_while(|line| line.first().unwrap_or(&None) != &Some('1'))
+        .collect::<Vec<_>>();
+    let num_stacks = horizontal_stack.last().map(|v| v.len()).unwrap_or(0);
+    let mut vertical_stack: Vec<Vec<char>> = Vec::with_capacity(num_stacks);
+    for _ in 0..num_stacks {
+        vertical_stack.push(vec![]);
+    }
+
+    for v in horizontal_stack.iter().rev() {
+        for (i, c) in v.iter().enumerate() {
+            if let Some(ch) = c {
+                vertical_stack[i].push(*ch);
+            }
+        }
+    }
+    vertical_stack
+}
+
+#[derive(Debug, Clone, Copy)]
+struct Move {
+    pub amount: usize,
+    pub from: usize,
+    pub to: usize,
+}
+
+impl Move {
+    fn play9000(&self, stacks: &mut [Vec<char>]) {
+        for _ in 0..self.amount {
+            if let Some(element) = stacks[self.from].pop() {
+                stacks[self.to].push(element);
+            }
+        }
+    }
+
+    fn play9001(&self, stacks: &mut [Vec<char>]) {
+        let i = stacks[self.from].len() - self.amount;
+        let mut moving = stacks[self.from].split_off(i);
+        stacks[self.to].append(&mut moving);
+    }
+}
+
+fn parse_move(line: &str) -> Move {
+    let (amount, from, to) = line
+        .split_whitespace()
+        .skip(1)
+        .step_by(2)
+        .map(|s| s.parse::<usize>().unwrap_or(0))
+        .take(3)
+        .collect_tuple()
+        .unwrap_or((0, 0, 0));
+    Move {
+        amount,
+        from: from - 1,
+        to: to - 1,
+    }
+}
+
+fn main() -> Result<()> {
+    let input = read_to_string("input.txt")?;
+    let mut lines = input.lines();
+    let mut stacks9000 = parse_stacks(&mut lines);
+    let mut stacks9001 = stacks9000.clone();
+    let moves = lines.skip(1).map(parse_move);
+    for m in moves {
+        m.play9000(&mut stacks9000);
+        m.play9001(&mut stacks9001);
+    }
+    let top9000 = stacks9000
+        .iter()
+        .map(|stack| stack.last().unwrap_or(&' '))
+        .fold(String::new(), |mut s, v| {
+            s.push(*v);
+            s
+        });
+    let top9001 = stacks9001
+        .iter()
+        .map(|stack| stack.last().unwrap_or(&' '))
+        .fold(String::new(), |mut s, v| {
+            s.push(*v);
+            s
+        });
+    println!("top crates 9000: {top9000}");
+    println!("top crates 9001: {top9001}");
+    Ok(())
 }

day6/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day6"
+version = "0.1.0"

day6/input.txt

@@ -0,0 +1 @@
+mvwvrwvwbblffmvmhmllmzmqzzbhbnnvrnvnmvvqrqrccpsstvvshvvpvvpddzwwjddfzzgbbzcchrrtzzmfffzqqsjjbfbjfjwffhrhrgrfrsfrsffbwwphwhgwgmgnggzwzhwzzpggnccdbcbssgccqgcgcvgccwffrqfqtqmqppwphhlbblnnwhwfhwhmhzhmmzbmbbjjmcjcggwlgltldttpccjlccbjccvfcvvdbvdvndvvmbmcbmmhphpbhhgjgllmljlqlwlclzlccrvrdvdzvzzzbrbrnbblplrplpsstdtjddgjgjgwjwzwbzwwrhwwbzwbwpwssvgvnnwnvvjqqswwsccwctwtntdndffjzfzmfzmfzmfzzhjzhzssdsgsnggbbqdqlqbllmglgddqppjjtzttlflrrczcmzzsppvfpvffcfrccvvvhjvhvfhfbbwdwrwswqqftfbfcfdfnfpnfflbbcmcqqsqwqqccmwmvwvffvdvlvtvqttnllqslsnllzplldmmzczhzmzzhllpfpqpnnqwwwrzzdpzzhccfvcvclcnnrjrmjrjlrlflqqtpqqdgqghhwdwdttlztttwmmvfmftfptphhddswdsdpdvpvpcpjjnvjvqvhvqqqfgqqgwqgwghwwmmvmvfmvvnvsslcclzlslppztzfzbzllcgllcsllvgvqvtqtsstztwwgjgghnhnhdnnqgnntqqtccdmcmhmpphpmmmbpbptpnnnmnppwlpwwfpwfwmfwfssbspslsflljpppbsspwptpwttfbtfftltvlttdmttllmggfcgfccvwcvczvvgvsgswsrrwppgcpggpgnngfnndrrdjrdrfdfmmjmsmbmmwjjjfzfdfbdbbtgbbcsbccgbbrvvrqrwqwmmhrhhbcbdbvdvzdvdjvvnwntwwdfwwrhrmhhnghhncccfttmpmrrjhhqddrsrvvssmrrgvgdgmmfqqhttspswpwlplpjljcjmjmvmdvvhbvvtqvqccczwwtlllztlzzpnnqznzddqsqvsshrrmccnppgrrjcjpccrvcvnvcncllffvnnbsbhhrmhmzzzhrhchjccgjcjwwhddmfmhhmrrrbccqddmjdmjdjtdjjmttzstsctssvvgghgbbhmhzmmjqqqqjgjfjpffpmpzmzszfzgzcggpmpnnqjqffgpghhszzvlzzdgzggqmggqlllcwwtzwwcfwccpjpggtqgtttzffdpffjzfzddzppprnprpqqbppvjpjzppbzpbzppwzzcnndsdzszbssqwqggnhggnzggpcpnndssghsggmfmrffvddvwvssjmjrmrmnndwdwhdhwwfjfjwjmwwqssmdsmdmssqzzrgzzjttnqnfqfcccvvmsvsvffccdjdccgtgqqjwqqnbqqnhqhrqrmrgmrrzjzrznzllwrlrbbcppctptwtfttlntnltnlnzzhrzhrzrtzzvsvfvjffsbsnbbfpphtptjjmffqgqnggnqnsshffslflggtlggmpggnfgfbgbfbcbbtdbdjqwfggzsfmzflttgdfqchhtjfwlmdnsbvmqcrhsrtwtjlmnlwbvjvqdzswdthbjslqzgmtzfjfcrgbhrrjtzgljbqfrzzqszhddnmzpnbgnflghnflwdmjdhgpnvwvnltcngwggqdznrpdtwsrclwwlfzhnjtpqcgzjqjnhcwbhndwvgrczhzwfjrdvjztdbjshmhrrqctjwpcdnpnvrtggrmhzhdtlntjphcddplgfvvmjzcbbpjbqbjwmnwqgftbmchghwvrlptvnfbffvgtdbtnfzwdmdlgzjbrvffvbrfwgjzzpbpcdzhcjbhfwnmqqwvjvnpgdqdjsmwdmrgfqrwhhqqjpfmvlncfdjchrccwpbptccdchqwvbcqzlhbfgrdzgncbwrzqpfszrcwtmnvbztjlzjlrqqfrnplhnmdjljcpnqssthhmjqrrlwdvsjswdwtfstmbvwhbptjnphjmnllbwffppzmdpchbcwcmgqzfmdqvhcmrvtgtjwlzfpnjnjtfvdhtjlqsdjwrrnflnsqrtfsnbjfdllhqslltsjqzdfqthqjjgrtqjwmlqqlhvszqswmdcbnwqgshpvfjdtvsqjvcnrnvtpfsgqszhtmcdlsqjwmttcqsdlvssrgwhtmtqwmttptnmgzpwzzrbwtsrjhmjpblztgftppcwwrjppvwlvdhwwdlfcdvhwpvhqpwrqsczvlmtghrrvqbphljcmcrfmwltlmnzchzrlbgspdjwfbhrmnfhvjwlgtghcpbfgdvrmwbqbprfvwpzqzrgqbhjtztwhjcjtncmbgjphsgdfvjwjljlwzhsdldqtdvgtzpwtmrbnpvqrmfdwngzqtsdjjztslrwdnfwgbnsjblcjzvmgbqllmdvvvdcvplgbzmhcrpbbjbfzhjgfpmjtrpmgvshzvqhcbcjzfcsvqggjcllcnjlrwqfpzldswzjgzvqwvszhrntnvlcpdcfqhqrtmhbdjqpfblrsbrhdfdwfgbhsnnjpgjvfpssfmhdbdncfrqbzpbttrhfzqnrttltqbvmhglbdpwmdbmgwcdsdsflmcnphwvbbhgqpqmwbdsmqwhcdftdlcfnstlfnzzsjhqzlsdmhpvlcqvhhlpdtzlqzlvbbwhhdsqhntbtpjjvnjlrncfmvnqmzwpldgrbfcfgdtlmrfzcbqfhvhpmsrrlnqwfggwrjsmnpnqhvvcfsfspfrmhwmbpqfhprzsswrczttlczhcqvgqqsnbhhfszqbswgtcjgddhngtcvlwqqmqzntrcwgwjhmhlgclpgtmqnpgwwhnjfdvvjgmqjlzsmwztpsdzrjlshswzljlmdzfqmqbtgtzlsfwqvwrdchjvrdnwdbprfvdvczstvnzfzzfmzbwjhtflbmhlgmfzrdfrqwfbltwqlqrghlprppvlqwggvczdcnmrmblhcfmpzdmqppgwhbbrjlzsvmsfzlrdljftcrdfdgmvrccwszpjmvdnbmfdnsgmgzsdpbrlsqvsmcwwqlwtwbgfvwtsmpqlnhjchnzrpncgtcqgwqrmqmrwsbmdvqcpggpzcjgtrhvnbpprlwfnjlvrgrdjjvncjmmflrpczqnlbqczggssqfcjcrghqlsztpdjpbbfcdjzzdjbljlsczdmrgshdscvhnltrwchjcmjzmjbhldnqzwwpswsnsldcbdcdpdgpjgwrnfbcpjtvzlhvgggldcfqcwwppvltsvsmwzwdgmhnfggtgtwldmrglcvmstgmbgbjhwwhgdhfrbjlwfhjfppdmffblbbzrplhlhqlsrnsthvjtglqntzcncmvhqnlsvvrscrhlncgncjswfgcvgjlwsndzmsbhbdqsggdgrsfqtzwnjpsdlbsqjrrjwwlbptwqpfqwvpsrtrmstddzdbjjlwvfqcpfczpsnmcgbfpbwcpljdhrgsqftbnplccjphwsdbprqfqqfcvtcdznnhrbdqpccphvdgtspmzzdbnslnrvtfrtbhcfzfgmhrttmdpwftvccjbllhqgtmpgwvbdjgtvtfbfnnsfgzqjmrpbcmqhpfbstznbvgtbhnwbbnjfsthdgdrpfdtvrtmgbwzqqpnlltbshjvnhsmqhqwzgbsfqqccfznjtnnzdrgcvwnlffdgvvqzvwhwfswdmqlrsglntzsnwjzgrhhwzzshwsfmlmrbnmrqlptmjgmtqctrmddzghsgtrbbcsmhtcnrzwmvrjmrnmhbjmflrclvlbzwbgmtnmwqgfmbbnnrdvhqcflglvzbmjzjtvnmrbgghnccfrphjshsgtrhfmmghhpwgclfvzfbdccsfrlfwtsjjnhlndpwcjdtlllhcsvwrwsbppqwhfcvnsnrvthrsbgmgjhpmjdndmdqdgzfvbqfmgfjrnrjchstrjprfwfnjqblhjdgsstvtpcsvmpbhggnwzncpjdhrcllcghhprhwhfgsqpfzphrdlcbrccglsb

day6/src/main.rs

@@ -1,3 +1,29 @@
-fn main() {
-    println!("Hello, world!");
+use std::{collections::HashSet, fs::read_to_string};
+
+fn find_nonrecuring_sequence(input: &[char], length: usize) -> Option<usize> {
+    input
+        .windows(length)
+        .enumerate()
+        .find(|(_, chars)| {
+            for i in 1..chars.len() {
+                if chars[..i].contains(&chars[i]) {
+                    return false;
+                }
+            }
+            true
+        })
+        //.find(|(_, chars)| chars.iter().collect::<HashSet<_>>().len() == length)
+        .map(|(i, _)| i + length)
+}
+
+fn main() -> Result<(), std::io::Error> {
+    const PACKET_START_LENGTH: usize = 4;
+    const MESSAGE_START_LENGTH: usize = 14;
+    let input = read_to_string("input.txt")?;
+    let input = input.chars().collect::<Vec<_>>();
+    let packet_marker = find_nonrecuring_sequence(&input, PACKET_START_LENGTH);
+    println!("first packet marker at {packet_marker:?}");
+    let message_marker = find_nonrecuring_sequence(&input, MESSAGE_START_LENGTH);
+    println!("first message marker at {message_marker:?}");
+    Ok(())
 }

day7/Cargo.lock

@@ -0,0 +1,56 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "blanket"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b04ce3d2372d05d1ef4ea3fdf427da6ae3c17ca06d688a107b5344836276bc3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "day7"
+version = "0.1.0"
+dependencies = [
+ "blanket",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b9b43d45702de4c839cb9b51d9f529c5dd26a4aff255b42b1ebc03e88ee908"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"

day7/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+blanket = "0.2"

day7/src/main.rs

@@ -1,3 +1,183 @@
-fn main() {
-    println!("Hello, world!");
+use std::{collections::HashMap, fs::read_to_string, iter::Peekable, str::Lines};
+
+/*
+#[derive(PartialEq, Debug)]
+struct File {
+    name: String,
+    size: usize,
+}
+
+impl File {
+    fn size(&self) -> usize {
+        self.size
+    }
+}
+
+#[derive(PartialEq, Debug)]
+struct Directory {
+    path: String,
+    files: Vec<File>,
+}
+
+fn size_of_dir(dirs: &[Directory], dir: &str) -> usize {
+    dirs.iter()
+        .filter_map(|d| {
+            if d.path.contains(dir) {
+                Some(d.files.iter().map(File::size).sum::<usize>())
+            } else {
+                None
+            }
+        })
+        .sum()
+}
+
+fn parse_command(
+    lines: &mut Peekable<Lines>,
+    cwd: &str,
+    directorys: &mut Vec<Directory>,
+) -> Result<String, String> {
+    let command = lines.next().unwrap().split_whitespace().collect::<Vec<_>>();
+    if command.len() < 2 || command[0] != "$" {
+        return Err("first line is not a command".to_owned());
+    }
+    match command[1] {
+        "cd" => {
+            if command.len() != 3 {
+                return Err("cd needs exactly 1 argument".to_owned());
+            }
+            match command[2] {
+                "/" => Ok("/".to_owned()),
+                ".." => {
+                    if cwd == "/" {
+                        Ok(cwd.to_owned())
+                    } else {
+                        let dirs = cwd.split_inclusive('/').collect::<Vec<_>>();
+                        let nwd = dirs[..(dirs.len() - 1)]
+                            .iter()
+                            .fold(String::new(), |s, v| s + v);
+                        Ok(nwd)
+                    }
+                }
+                dir => Ok(cwd.to_owned() + dir + "/"),
+            }
+        }
+        "ls" => {
+            while let Some(line) = lines.peek() {
+                if line.split_whitespace().collect::<Vec<_>>().first() == Some(&"$") {
+                    break;
+                }
+                let line = lines.next().unwrap();
+                let node = line.split_whitespace().collect::<Vec<_>>();
+                if node.len() != 2 {
+                    return Err("ls needs two inputs per line".to_owned());
+                }
+                match node[0] {
+                    "dir" => directorys.push(Directory {
+                        path: cwd.to_owned() + node[1] + "/",
+                        files: vec![],
+                    }),
+                    size => directorys
+                        .iter_mut()
+                        .find(|d| d.path == cwd)
+                        .unwrap()
+                        .files
+                        .push(File {
+                            name: node[1].to_owned(),
+                            size: size.parse().expect("invalid Size"),
+                        }),
+                }
+            }
+            Ok(cwd.to_owned())
+        }
+        _ => Err("unknown command".to_owned()),
+    }
+}
+
+fn main() {
+    const TOTAL_SPACE: usize = 70000000;
+    const NEEDED_FREE: usize = 30000000;
+    let input = read_to_string("input.txt").unwrap();
+    let mut lines = input.lines().peekable();
+    let mut dirs = vec![Directory {
+        path: "/".to_owned(),
+        files: vec![],
+    }];
+    let mut cwd = "/".to_owned();
+    while lines.peek().is_some() {
+        cwd = parse_command(&mut lines, &cwd, &mut dirs).expect("invalid input");
+    }
+    let sizes = dirs.iter().map(|d| size_of_dir(&dirs, &d.path));
+    let sol1: usize = sizes.clone().filter(|s| s < &100_000).sum();
+    println!("{sol1}");
+    let used = size_of_dir(&dirs, "/");
+    let free = TOTAL_SPACE - used;
+    let additional = NEEDED_FREE - free;
+    println!("{used} Bytes used, {free} Bytes free, {additional} Bytes need to be freed");
+    let sol2 = sizes.filter(|s| s >= &additional).min().unwrap();
+    println!("Deleting Directory with size {sol2}");
+}
+*/
+
+fn main() {
+    let input = read_to_string("input.txt").unwrap();
+    let mut cwd = "/".to_owned();
+    let mut files = HashMap::new();
+    for line in input.lines() {
+        let line = line.split_whitespace().collect::<Vec<_>>();
+        match line.len() {
+            3 => match line[2] {
+                "/" => cwd = "/".to_owned(),
+                ".." => {
+                    cwd = {
+                        if cwd == "/" {
+                            cwd
+                        } else {
+                            let dirs = cwd.split_inclusive('/').collect::<Vec<_>>();
+                            let nwd = dirs[..(dirs.len() - 1)]
+                                .iter()
+                                .fold(String::new(), |s, v| s + v);
+                            nwd
+                        }
+                    }
+                }
+                dir => cwd = cwd + dir + "/",
+            },
+            2 => {
+                if (line[0] != "$") && (line[0] != "dir") {
+                    let size = line[0].parse::<usize>().unwrap();
+                    let path = cwd.clone() + line[1];
+                    files.insert(path, size);
+                }
+            }
+            _ => (),
+        }
+    }
+    let mut directories = HashMap::new();
+    for (path, size) in files {
+        let mut folders = path
+            .split_terminator('/')
+            .map(|s| s.to_owned())
+            .collect::<Vec<String>>();
+        folders.pop();
+        for (index, folder) in folders.clone().iter().enumerate() {
+            let previus = if index > 0 { &folders[index - 1] } else { "" };
+            folders[index] = previus.to_owned() + folder + "/";
+        }
+        for folder in folders {
+            *directories.entry(folder).or_insert(0) += size;
+        }
+    }
+    let result1: usize = directories.values().filter(|&&size| size < 100_000).sum();
+    const TOTAL_SPACE: usize = 70000000;
+    const NEEDED_FREE: usize = 30000000;
+    let used = *directories.entry("/".to_owned()).or_insert(0);
+    let free = TOTAL_SPACE - used;
+    let additional = NEEDED_FREE - free;
+    let result2: usize = directories
+        .values()
+        .filter(|&&size| size >= additional)
+        .min()
+        .map(|size| *size)
+        .unwrap_or(0);
+    println!("{result1} bytes used by directories smaller than 100000. {result2} Bytes removed by the smallest directory");
 }

day8/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day8"
+version = "0.1.0"

day8/input.txt

@@ -0,0 +1,99 @@
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day8/src/main.rs

@@ -1,3 +1,84 @@
+use std::{collections::HashSet, fs::read_to_string};
+
 fn main() {
-    println!("Hello, world!");
+    let input = read_to_string("input.txt").unwrap();
+    let input = input
+        .lines()
+        .map(|line| {
+            line.chars()
+                .map(|c| String::from(c).parse::<i8>().unwrap())
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>();
+    let mut visible_trees = HashSet::new();
+    println!("size: {}x{}", input.len(), input[0].len());
+    if input.len() != input[0].len() {
+        panic!("field not square");
+    }
+    let length = input.len();
+    for i in 0..length {
+        let rev_i = length - i - 1;
+        let mut max_values = [-1; 4];
+        for j in 0..length {
+            let rev_j = length - j - 1;
+            if input[i][j] > max_values[0] {
+                max_values[0] = input[i][j];
+                visible_trees.insert((i, j));
+            }
+            if input[j][i] > max_values[1] {
+                max_values[1] = input[j][i];
+                visible_trees.insert((j, i));
+            }
+            if input[rev_i][rev_j] > max_values[2] {
+                max_values[2] = input[rev_i][rev_j];
+                visible_trees.insert((rev_i, rev_j));
+            }
+            if input[rev_j][rev_i] > max_values[3] {
+                max_values[3] = input[rev_j][rev_i];
+                visible_trees.insert((rev_j, rev_i));
+            }
+        }
+    }
+
+    let greatest_view = input
+        .iter()
+        .enumerate()
+        .map(|(x, line)| {
+            let input = &input;
+            line.iter().enumerate().map(move |(y, tree)| {
+                let mut view = [0; 4];
+                for radius in 1..length {
+                    let left = x as isize - radius as isize;
+                    let right = x as isize + radius as isize;
+                    let up = y as isize - radius as isize;
+                    let down = y as isize + radius as isize;
+                    if view.iter().all(|v| *v != 0) {
+                        break;
+                    }
+                    if x != 0 && view[0] == 0 && (left == 0 || input[left as usize][y] >= *tree) {
+                        view[0] = radius;
+                    }
+                    if y != 0 && view[1] == 0 && (up == 0 || input[x][up as usize] >= *tree) {
+                        view[1] = radius;
+                    }
+                    if x != length - 1
+                        && view[2] == 0
+                        && (right == length as isize - 1 || input[right as usize][y] >= *tree)
+                    {
+                        view[2] = radius;
+                    }
+                    if y != length - 1
+                        && view[3] == 0
+                        && (down == length as isize - 1 || input[x][down as usize] >= *tree)
+                    {
+                        view[3] = radius;
+                    }
+                }
+                view.iter().fold(1, |p, v| p * v)
+            })
+        })
+        .flatten()
+        .max()
+        .unwrap();
+    println!("Greatest view is {}", greatest_view);
 }

day9/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day9"
+version = "0.1.0"

day9/src/main.rs

@@ -1,3 +1,170 @@
-fn main() {
-    println!("Hello, world!");
+use std::{
+    collections::HashSet,
+    fs::read_to_string,
+    mem::MaybeUninit,
+    ops::{Add, AddAssign, Sub, SubAssign},
+};
+
+#[derive(Debug, Eq, PartialEq, Clone, Copy)]
+enum Direction {
+    Up,
+    Down,
+    Left,
+    Right,
+}
+
+impl TryFrom<&str> for Direction {
+    type Error = &'static str;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        match value {
+            "U" => Ok(Self::Up),
+            "D" => Ok(Self::Down),
+            "L" => Ok(Self::Left),
+            "R" => Ok(Self::Right),
+            _ => Err("invalid Direction"),
+        }
+    }
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Copy)]
+struct Movement {
+    direction: Direction,
+    steps: usize,
+}
+
+impl TryFrom<&str> for Movement {
+    type Error = &'static str;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        let words = value.split_whitespace().collect::<Vec<_>>();
+        match &words[..] {
+            [direction, steps] => Ok(Movement {
+                direction: Direction::try_from(*direction)?,
+                steps: match steps.parse::<usize>() {
+                    Ok(it) => it,
+                    Err(_) => return Err("unable to parse steps"),
+                },
+            }),
+            _ => Err("Need 2 words in format [Direction] [Steps]"),
+        }
+    }
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Copy, Default, Hash)]
+struct Position {
+    x: i32,
+    y: i32,
+}
+
+impl Add for Position {
+    type Output = Position;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+
+impl AddAssign for Position {
+    fn add_assign(&mut self, rhs: Self) {
+        self.x += rhs.x;
+        self.y += rhs.y;
+    }
+}
+
+impl Sub for Position {
+    type Output = Position;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+
+impl SubAssign for Position {
+    fn sub_assign(&mut self, rhs: Self) {
+        self.x += rhs.x;
+        self.y += rhs.y;
+    }
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Default)]
+struct Link {
+    head: Position,
+    tail: Position,
+    tail_positions: HashSet<Position>,
+}
+
+impl Link {
+    fn simulate_position(&mut self, head_position: &Position) {
+        self.head = *head_position;
+        let distance = self.head - self.tail;
+        if distance.x.abs() > 1 || distance.y.abs() > 1 {
+            self.tail.x += distance.x.signum();
+            self.tail.y += distance.y.signum();
+        }
+        self.tail_positions.insert(self.tail);
+    }
+}
+
+#[derive(Debug, Eq, PartialEq, Clone)]
+struct Rope<const N: usize> {
+    links: [Link; N],
+}
+
+impl<const N: usize> Rope<N> {
+    fn simulate(mut self, movement: &Movement) -> Self {
+        for _ in 0..movement.steps {
+            let head_position = self.links[0].head
+                + match movement.direction {
+                    Direction::Up => Position { x: 0, y: -1 },
+                    Direction::Down => Position { x: 0, y: 1 },
+                    Direction::Left => Position { x: -1, y: 0 },
+                    Direction::Right => Position { x: 1, y: 0 },
+                };
+            self.links[0].simulate_position(&head_position);
+            for i in 1..self.links.len() {
+                let previous = self.links[i - 1].tail;
+                self.links[i].simulate_position(&previous);
+            }
+        }
+        self
+    }
+}
+
+impl<const N: usize> Default for Rope<N> {
+    fn default() -> Self {
+        let mut links: [Link; N] = unsafe { MaybeUninit::zeroed().assume_init() };
+        links.fill(Default::default());
+        Self { links }
+    }
+}
+
+fn main() {
+    let input = "R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20";
+    let input = read_to_string("input.txt").unwrap_or_else(|_| input.to_owned());
+
+    let rope = input
+        .lines()
+        .flat_map(Movement::try_from)
+        .fold(Rope::<9>::default(), |rope, movement| {
+            rope.simulate(&movement)
+        });
+    println!(
+        "The second knot visited {} positions, the tail visited {} positions",
+        rope.links[0].tail_positions.len(),
+        rope.links[8].tail_positions.len()
+    );
 }