2022 Day 1

2022/.gitignore

@@ -0,0 +1,2 @@
+/input
+/target

2022/Cargo.lock

@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "216261ddc8289130e551ddcd5ce8a064710c0d064a4d2895c67151c92b5443f6"
+
+[[package]]
+name = "aoc2022"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+]

2022/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "aoc2022"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0.66"

2022/src/bin/day01.rs

@@ -0,0 +1,53 @@
+const INPUT: &str = include_str!("../../input/day01.txt");
+
+fn main() {
+    println!("{}", part1(INPUT).unwrap());
+    println!("{}", part2(INPUT).unwrap());
+}
+
+#[derive(Debug, Clone, Default)]
+struct Elf {
+    fruits: Vec<u32>,
+}
+
+impl Elf {
+    fn total(&self) -> u32 {
+        self.fruits.iter().sum()
+    }
+}
+
+fn part1(input: &str) -> anyhow::Result<u32> {
+    let mut elves: Vec<Elf> = vec![];
+
+    for section in input.split("\n\n") {
+        let mut elf = Elf::default();
+
+        for fruit in section.split('\n').filter(|line| !line.is_empty()) {
+            let cals: u32 = fruit.parse()?;
+            elf.fruits.push(cals);
+        }
+
+        elves.push(elf);
+    }
+
+    let most_food = elves.iter().cloned().max_by_key(Elf::total).unwrap();
+    Ok(most_food.total())
+}
+
+fn part2(input: &str) -> anyhow::Result<u32> {
+    let mut elves: Vec<Elf> = vec![];
+
+    for section in input.split("\n\n") {
+        let mut elf = Elf::default();
+
+        for fruit in section.split('\n').filter(|line| !line.is_empty()) {
+            let cals: u32 = fruit.parse()?;
+            elf.fruits.push(cals);
+        }
+
+        elves.push(elf);
+    }
+
+    elves[..].sort_by_key(|e| std::cmp::Reverse(e.total()));
+    Ok(elves[0..3].iter().map(Elf::total).sum())
+}

README.md

@@ -3,12 +3,13 @@ I like solving the [Advent of Code](https://adventofcode.com/) challenges every
 - 2015: TODO
 - 2016: TODO
 - 2017: Python
-- 2018: Rust
+- 2018: Rust (v1.30, 2018 edition)
 - 2019: Ruby
 - 2020: Elixir
 - 2021: Go
+- 2022: Rust (Again! v1.65, 2021 edition)
 
-Languages I'd like to use for the TODO years:
+Languages I'd like to use for the future or TODO years:
 - J (or other APL-like)
 - Haskell
 - Zig