readying 2022 to merge

2022/day1/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day1"
+version = "0.1.0"

2022/day1/Cargo.toml

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+[package]
+name = "day1"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+repository.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools.workspace = true

2022/day1/src/main.rs

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+#![warn(clippy::all, clippy::pedantic)]
+
+use std::fs;
+
+use itertools::Itertools;
+fn part1(input: &[u64]) -> String {
+    input.iter().max().unwrap().to_string()
+}
+
+fn part2(input: &[u64]) -> String {
+    input
+        .iter()
+        //order the elves since we don't care about position anymore
+        .sorted_by(|a, b| b.cmp(a))
+        .take(3)
+        .copied()
+        .sum::<u64>()
+        .to_string()
+}
+
+fn parse_input(input: &str) -> Vec<u64> {
+    input.lines().fold(vec![0_u64], |mut acc, line| {
+        //empty lines mean new elf
+        if line.is_empty() {
+            acc.push(0_u64);
+        } else {
+            // the first time through is an edge case preventing an else here
+            let last = acc.last_mut().unwrap();
+            *last += line.parse::<u64>().unwrap();
+        }
+        acc
+    })
+}
+fn main() -> std::io::Result<()> {
+    let file = fs::read_to_string("input")?;
+
+    let elves = parse_input(&file);
+
+    //part 1 is get the max
+    println!("Part 1: {}", part1(&elves));
+
+    //Part 2 is get the sum of the largest 3
+    println!("Part 2: {}", part2(&elves));
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const INPUT: &str = "2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000";
+
+    #[test]
+    fn part1_works() {
+        let input = parse_input(INPUT);
+        assert_eq!(part1(&input), "24000")
+    }
+
+    #[test]
+    fn part2_works() {
+        let input = parse_input(INPUT);
+        assert_eq!(part2(&input), "45000")
+    }
+}