start year 2022 day 05

src/year2022/day05.rs

@@ -0,0 +1,64 @@
+use std::collections::BTreeMap;
+
+use crate::util::parse::ParseExt;
+
+fn parse(input: &str) -> (BTreeMap<usize, Vec<char>>, Vec<[u32; 3]>) {
+    let mut crates: BTreeMap<usize, Vec<char>> = BTreeMap::new();
+    let mut moves = vec![];
+    let (board, moveset) = input.split_once("\n\n\n").expect("must be there");
+
+    board.lines().for_each(|line| {
+        if !line.contains('[') {
+            return;
+        }
+
+        line.chars()
+            .enumerate()
+            .filter(|(_idx, c)| c.is_ascii_uppercase())
+            .for_each(|(idx, c)| {
+                crates
+                    .entry(((idx - 4) / 4) + 1)
+                    .and_modify(|v| v.push(c))
+                    .or_insert(vec![]);
+            });
+    });
+    crates.values_mut().for_each(|v| v.reverse());
+
+    let moves = moveset
+        .lines()
+        .map(|line| {
+            let mut nums = line.u32s();
+            [
+                nums.next().expect("first num"),
+                nums.next().expect("second num"),
+                nums.next().expect("third num"),
+            ]
+        })
+        .collect();
+
+    (crates, moves)
+}
+
+pub fn part1(input: &str) -> impl std::fmt::Display {
+    ""
+}
+
+pub fn part2(input: &str) -> impl std::fmt::Display {
+    ""
+}
+
+#[test]
+fn test_part1() {
+    assert_eq!(
+        "2",
+        part1("2-4,6-8\n2-3,4-5\n5-7,7-9\n2-8,3-7\n6-6,4-6\n2-6,4-8").to_string()
+    )
+}
+
+#[test]
+fn test_part2() {
+    assert_eq!(
+        "4",
+        part2("2-4,6-8\n2-3,4-5\n5-7,7-9\n2-8,3-7\n6-6,4-6\n2-6,4-8").to_string()
+    )
+}