day 4

src/days/day4.rs

@@ -0,0 +1,38 @@
+use std::ops::Range;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+
+#[aoc_generator(day4)]
+fn generator(s: &str) -> Vec<(Range<u32>, Range<u32>)> {
+    s.lines()
+        .map(|l| {
+            let (a, b) = l.split_once(',').unwrap();
+            let a = a.split_once('-').unwrap();
+            let b = b.split_once('-').unwrap();
+            (
+                a.0.parse().unwrap()..a.1.parse().unwrap(),
+                b.0.parse().unwrap()..b.1.parse().unwrap(),
+            )
+        })
+        .collect()
+}
+
+#[aoc(day4, part1)]
+fn part1(input: &[(Range<u32>, Range<u32>)]) -> u32 {
+    input
+        .iter()
+        .filter(|(a, b)| {
+            (a.start <= b.start && a.end >= b.end) || (a.start >= b.start && a.end <= b.end)
+        })
+        .count() as u32
+}
+
+#[aoc(day4, part2)]
+fn part2(input: &[(Range<u32>, Range<u32>)]) -> u32 {
+    input
+        .iter()
+        .filter(|(a, b)| {
+            (a.start <= b.end && a.start >= b.start) || (b.start <= a.end && b.start >= a.start)
+        })
+        .count() as u32
+}

src/lib.rs

@@ -4,6 +4,7 @@ mod days {
     mod day1;
     mod day2;
     mod day3;
+    mod day4;
 }
 
 aoc_lib! { year = 2022 }