Rust Day 3

rust/Cargo.lock

@@ -4,4 +4,4 @@ version = 3
 
 [[package]]
 name = "advent-of-code"
-version = "22.2.2"
+version = "22.3.2"

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "advent-of-code"
-version = "22.2.2"
+version = "22.3.2"
 edition = "2021"
 resolver = "2"
 
@@ -33,4 +33,8 @@ path = "src/day01/main.rs"
 
 [[bin]]
 name = "day02"
-path = "src/day02/main.rs"
+path = "src/day02/main.rs"
+
+[[bin]]
+name = "day03"
+path = "src/day03/main.rs"

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rust/src/day03/main.rs

@@ -0,0 +1,19 @@
+const INPUT: &str = include_str!("input.txt");
+
+mod part_1;
+use part_1::part_1;
+mod part_2;
+use part_2::part_2;
+
+pub(crate) fn character_priority(character: u8) -> u64 {
+    (match character {
+        b'a'..=b'z' => character - b'a' + 1,
+        b'A'..=b'Z' => character - b'A' + 27,
+        _ => panic!("Invalid character '{character}', no priority"),
+    }) as u64
+}
+
+pub fn main() {
+    part_1(INPUT);
+    part_2(INPUT);
+}

rust/src/day03/part_1.rs

@@ -0,0 +1,36 @@
+use std::collections::HashSet;
+
+pub(crate) fn part_1(input: &'static str) {
+    let rucksacks = input.lines();
+    let compartments = rucksacks.map(|rucksack| {
+        let compartment_size = rucksack.len() / 2;
+        let compartments = (
+            rucksack
+                .bytes()
+                .take(compartment_size)
+                .collect::<HashSet<_>>(),
+            rucksack
+                .bytes()
+                .skip(compartment_size)
+                .take(compartment_size)
+                .collect::<HashSet<_>>(),
+        );
+        compartments
+    });
+    let mut running_sum = 0;
+    for compartments in compartments {
+        let same_bytes =
+            HashSet::intersection(&compartments.0, &compartments.1).collect::<Vec<_>>();
+        assert_eq!(
+            same_bytes.len(),
+            1,
+            "{}",
+            same_bytes
+                .iter()
+                .map(|byte| char::from(**byte))
+                .collect::<String>()
+        );
+        running_sum += crate::character_priority(*same_bytes[0]);
+    }
+    println!("Part 1: {running_sum}");
+}

rust/src/day03/part_2.rs

@@ -0,0 +1,23 @@
+use std::collections::HashSet;
+
+use crate::character_priority;
+
+pub(crate) fn part_2(input: &'static str) {
+    let rucksacks = input.lines();
+    let compartments = rucksacks
+        .map(|rucksack| rucksack.bytes().collect::<HashSet<_>>())
+        .collect::<Vec<_>>();
+    assert_eq!(compartments.len() % 3, 0);
+
+    let mut running_sum = 0;
+    for group_compartments in compartments.chunks_exact(3) {
+        let group_bytes = &group_compartments[0]
+            .intersection(&group_compartments[1])
+            .copied()
+            .filter(|byte| group_compartments[2].contains(byte))
+            .collect::<Vec<_>>();
+        assert_eq!(group_bytes.len(), 1);
+        running_sum += character_priority(group_bytes[0]);
+    }
+    println!("Part 2: {running_sum}");
+}