perf improvements and solution for year2022 day01

src/year2022/day01.rs

@@ -0,0 +1,25 @@
+use crate::util::parse::ParseExt;
+
+fn calories(input: &str) -> impl Iterator<Item = u32> + '_ {
+    input.split("\n\n").map(|set| set.u32s().sum())
+}
+
+pub fn part1(input: &str) -> impl std::fmt::Display {
+    calories(input).max().expect("must have one max")
+}
+
+pub fn part2(input: &str) -> impl std::fmt::Display {
+    let mut items: Vec<_> = calories(input).collect();
+    items.sort_unstable();
+    items.iter().rev().take(3).sum::<u32>()
+}
+
+#[test]
+fn test_part1() {
+    assert_eq!("24000", part1("1000\n2000\n3000\n\n4000\n\n5000\n6000\n\n7000\n8000\n9000\n\n10000").to_string())
+}
+
+#[test]
+fn test_part2() {
+    assert_eq!("4", part2("R8, R4, R4, R8").to_string())
+}