Day 1, 2 and 3

day1/.gitignore

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+/target

day1/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc1"
+version = "0.1.0"

day1/Cargo.toml

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+[package]
+name = "aoc1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/src/main.rs

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+#![feature(test)]
+
+use std::{collections::BinaryHeap, fs::read_to_string};
+
+fn main() {
+    let input = read_to_string("input.txt").expect("need input file");
+    let (max, top3) = initial(&input);
+    println!("{max}, {top3}");
+    let (max, top3) = idiomatic(&input);
+    println!("{max}, {top3}");
+}
+
+fn idiomatic(input: &str) -> (u32, u32) {
+    let mut sums: BinaryHeap<_> = input
+        .split_terminator("\n\n")
+        .map(|block| {
+            block
+                .split_terminator('\n')
+                .map(|line| line.parse::<u32>().unwrap_or_default())
+                .sum()
+        })
+        .collect();
+    let max = sums.pop().unwrap_or_default();
+    let top3 = max + sums.pop().unwrap_or_default() + sums.pop().unwrap_or_default();
+    (max, top3)
+}
+
+fn initial(input: &str) -> (u32, u32) {
+    let numbers = input.split_terminator('\n').map(|s| s.parse::<u32>().ok());
+    let mut elves = vec![0];
+    for number in numbers {
+        match number {
+            Some(ration) => {
+                *elves.last_mut().unwrap() += ration;
+            }
+            None => elves.push(0),
+        }
+    }
+    let (index, max) = elves.iter().enumerate().max_by_key(|(_, v)| **v).unwrap();
+    let mut elves = elves.clone();
+    elves.remove(index);
+    let (index, second) = elves.iter().enumerate().max_by_key(|(_, v)| **v).unwrap();
+    let mut elves = elves.clone();
+    elves.remove(index);
+    let third = elves.iter().max().unwrap();
+    let top3 = max + second + third;
+    (*max, top3)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::{
+        fs::File,
+        io::{BufRead, BufReader},
+    };
+
+    use super::*;
+    extern crate test;
+    use test::Bencher;
+
+    #[bench]
+    fn bench_initial(b: &mut Bencher) {
+        let input = read_to_string("input.txt").expect("need input file");
+        b.iter(|| initial(&input));
+    }
+
+    #[bench]
+    fn bench_idiomatic(b: &mut Bencher) {
+        let input = read_to_string("input.txt").expect("need input file");
+        b.iter(|| idiomatic(&input));
+    }
+
+    #[bench]
+    fn bench_read_string(b: &mut Bencher) {
+        b.iter(|| {
+            read_to_string("input.txt")
+                .unwrap()
+                .split_terminator('\n')
+                .for_each(drop);
+        });
+    }
+
+    #[bench]
+    fn bench_lines(b: &mut Bencher) {
+        b.iter(|| {
+            BufReader::new(File::open("input.txt").unwrap())
+                .lines()
+                .for_each(drop);
+        });
+    }
+}

day10/.gitignore

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+/target

day10/Cargo.toml

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+[package]
+name = "day10"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day10/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

day11/.gitignore

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+/target

day11/Cargo.toml

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+[package]
+name = "day11"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day11/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day12/.gitignore

@@ -0,0 +1 @@
+/target

day12/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day12"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day12/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day13/.gitignore

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+/target

day13/Cargo.toml

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+[package]
+name = "day13"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day13/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day14/.gitignore

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+/target

day14/Cargo.toml

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+[package]
+name = "day14"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day14/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day15/.gitignore

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+/target

day15/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day15"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day15/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day16/.gitignore

@@ -0,0 +1 @@
+/target

day16/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day16"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day16/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day17/.gitignore

@@ -0,0 +1 @@
+/target

day17/Cargo.toml

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+[package]
+name = "day17"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day17/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day18/.gitignore

@@ -0,0 +1 @@
+/target

day18/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day18"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day18/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day19/.gitignore

@@ -0,0 +1 @@
+/target

day19/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day19"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day19/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day2/.gitignore

@@ -0,0 +1 @@
+/target

day2/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day2"
+version = "0.1.0"

day2/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day2/src/main.rs

@@ -0,0 +1,117 @@
+use std::fs::read_to_string;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum Symbol {
+    Rock,
+    Paper,
+    Scissors,
+}
+
+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,
+            _ => panic!("invalid input"),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum Outcome {
+    Win,
+    Draw,
+    Lose,
+}
+
+impl From<char> for Outcome {
+    fn from(value: char) -> Self {
+        match value {
+            'X' => Self::Lose,
+            'Y' => Self::Draw,
+            'Z' => Self::Win,
+            _ => panic!("invalid input"),
+        }
+    }
+}
+
+impl Symbol {
+    fn play(self, opponent: Self) -> Outcome {
+        if self == opponent {
+            Outcome::Draw
+        } else if (self == Self::Rock && opponent == Self::Scissors)
+            || (self == Self::Paper && opponent == Self::Rock)
+            || (self == Self::Scissors && opponent == Self::Paper)
+        {
+            Outcome::Win
+        } else {
+            Outcome::Lose
+        }
+    }
+}
+
+fn score(play: Symbol, result: Outcome) -> u32 {
+    let score = match play {
+        Symbol::Rock => 1,
+        Symbol::Paper => 2,
+        Symbol::Scissors => 3,
+    };
+    let score2 = match result {
+        Outcome::Lose => 0,
+        Outcome::Draw => 3,
+        Outcome::Win => 6,
+    };
+    score + score2
+}
+
+fn get_play(opponent: Symbol, outcome: Outcome) -> Symbol {
+    match outcome {
+        Outcome::Win => match opponent {
+            Symbol::Rock => Symbol::Paper,
+            Symbol::Paper => Symbol::Scissors,
+            Symbol::Scissors => Symbol::Rock,
+        },
+        Outcome::Draw => opponent,
+        Outcome::Lose => match opponent {
+            Symbol::Rock => Symbol::Scissors,
+            Symbol::Paper => Symbol::Rock,
+            Symbol::Scissors => Symbol::Paper,
+        },
+    }
+}
+
+fn initial(input: &str) -> (u32, u32) {
+    let first = input
+        .split_terminator('\n')
+        .map(|line| {
+            line.split_whitespace()
+                .map(|s| Symbol::from(s.chars().next().unwrap()))
+                .collect::<Vec<_>>()
+        })
+        .map(|p| score(p[1], p[1].play(p[0])))
+        .sum();
+    let second = input
+        .split_terminator('\n')
+        .map(|line| {
+            let chars: Vec<_> = line
+                .split_whitespace()
+                .map(|s| s.chars().next().unwrap())
+                .collect();
+            let opponent = Symbol::from(chars[0]);
+            let outcome = Outcome::from(chars[1]);
+            let play = get_play(opponent, outcome);
+            score(play, outcome)
+        })
+        .sum();
+    (first, second)
+}
+
+fn main() {
+    let input = read_to_string("input.txt").expect("input needed");
+    let score = initial(&input);
+    println!("score: {score:?}");
+}

day20/.gitignore

@@ -0,0 +1 @@
+/target

day20/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day20"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day20/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day21/.gitignore

@@ -0,0 +1 @@
+/target

day21/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day21"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day21/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day22/.gitignore

@@ -0,0 +1 @@
+/target

day22/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day22"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day22/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day23/.gitignore

@@ -0,0 +1 @@
+/target

day23/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day23"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day23/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day24/.gitignore

@@ -0,0 +1 @@
+/target

day24/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day24"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day24/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day25/.gitignore

@@ -0,0 +1 @@
+/target

day25/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day25"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day25/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day3/.gitignore

@@ -0,0 +1 @@
+/target

day3/Cargo.lock

@@ -0,0 +1,243 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
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+ "gimli",
+]
+
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+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
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+ "tracing-error",
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+ "tracing-core",
+ "tracing-error",
+]
+
+[[package]]
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+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"

day3/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day3"
+version = "0.1.0"
+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"

day3/input.txt

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+FChzzBWhVzrgMwffJwlnngnTlJ
+MCvqvhFzcHCChjtpNNVLppGmbq
+bZZzJnccqdzcLhrcQDLrDs
+FfCfWVfjWTFClClfwjWCfGGwhZSDhSLsSSRpZprLph
+mFmTMmFjMMWFfZtttflWjmWTngNHJHggJJHtzgnJvBtBgHdv

day3/input.txt.test

@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw

day3/src/main.rs

@@ -0,0 +1,47 @@
+use std::{collections::HashSet, fs::read_to_string};
+
+use color_eyre::{eyre::*, Result};
+use itertools::Itertools;
+
+fn priority(item: &char) -> usize {
+    ('a'..='z')
+        .position(|c| *item == c)
+        .map(|i| i + 1)
+        .or_else(|| ('A'..='Z').position(|c| *item == c).map(|i| i + 27))
+        .unwrap_or(0)
+}
+
+fn initial(input: &str) -> (usize, usize) {
+    let output1 = input
+        .lines()
+        .map(|line| {
+            let (compartment1, compartment2) = line.split_at(line.len() / 2);
+            let compartment1 = compartment1.chars().collect::<HashSet<_>>();
+            let compartment2 = compartment2.chars().collect::<HashSet<_>>();
+            compartment1
+                .intersection(&compartment2)
+                .map(priority)
+                .sum::<usize>()
+        })
+        .sum();
+    let output2 = input
+        .lines()
+        .chunks(3)
+        .into_iter()
+        .map(|group| {
+            group
+                .map(|line| line.chars().collect::<HashSet<_>>())
+                .coalesce(|a, b| Ok(a.intersection(&b).copied().collect()))
+                .map(|set| set.iter().map(priority).sum::<usize>())
+                .sum::<usize>()
+        })
+        .sum();
+    (output1, output2)
+}
+
+fn main() -> Result<()> {
+    let input = read_to_string("input.txt").wrap_err("reading input.txt")?;
+    let output = initial(&input);
+    println!("output: {output:?}");
+    Ok(())
+}

day4/.gitignore

@@ -0,0 +1 @@
+/target

day4/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day4/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day5/.gitignore

@@ -0,0 +1 @@
+/target

day5/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day5"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day5/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day6/.gitignore

@@ -0,0 +1 @@
+/target

day6/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day6"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day6/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day7/.gitignore

@@ -0,0 +1 @@
+/target

day7/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day7"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day7/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day8/.gitignore

@@ -0,0 +1 @@
+/target

day8/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day8"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day8/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

day9/.gitignore

@@ -0,0 +1 @@
+/target

day9/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day9"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day9/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}