Day 4

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,
+            'A' | 'X' => Self::Rock,
-            'B' => Self::Paper,
+            'B' | 'Y' => Self::Paper,
-            'C' => Self::Scissors,
+            'C' | 'Z' => Self::Scissors,
-            'X' => Self::Rock,
-            'Y' => Self::Paper,
-            '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))
+        .or_else(|| ('A'..='Z').position(|c| item == c).map(|i| i + 27))
-        .unwrap_or(0)
+        .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 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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+dependencies = [
+ "gimli",
+]
+
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+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
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+ "color-spantrace",
+ "eyre",
+ "indenter",
+ "once_cell",
+ "owo-colors",
+ "tracing-error",
+]
+
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+ "tracing-core",
+ "tracing-error",
+]
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+]
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+ "once_cell",
+ "valuable",
+]
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+ "tracing",
+ "tracing-subscriber",
+]
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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() {
+use std::fs::read_to_string;
-    println!("Hello, world!");
+
+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(())
 }