day 1

.gitignore

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+target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc2022"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "aoc2022"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/bin/day01_1.rs

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+use std::fs;
+use aoc2022::day01::process_part_1;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day1.txt").unwrap();
+    println!("{}", process_part_1(&file));
+}

src/bin/day01_2.rs

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+use std::fs;
+use aoc2022::day01::process_part_2;
+
+fn main() {
+    let file = fs::read_to_string("./input.txt").unwrap();
+    println!("{}", process_part_2(&file));
+}

src/day01.rs

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+pub fn process_part_1(input: &str) -> u32 {
+    let result = input
+        .split("\n\n")
+        .map(|part| part.lines().map(|snack| snack.parse::<u32>().unwrap()).sum::<u32>())
+        .max()
+        .unwrap();
+    return result;
+}
+
+pub fn process_part_2(input: &str) -> u32 {
+    let mut calories = input
+        .split("\n\n")
+        .map(|part| part.lines().map(|snack| snack.parse::<u32>().unwrap()).sum::<u32>())
+        .collect::<Vec<_>>();
+    calories.sort_by(|a, b| b.cmp(a));
+    calories.iter().take(3).sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000";
+
+    #[test]
+    fn day1() {
+        assert_eq!(process_part_1(INPUT), 24000);
+    }
+
+    #[test]
+    fn day2() {
+        assert_eq!(process_part_2(INPUT), 45000);
+    }
+}

src/lib.rs

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+pub mod day01;