1 files changed, 52 insertions, 0 deletions
diff --git a/aoc22/day4/src/main.rs b/aoc22/day4/src/main.rs
new file mode 100644
index 0000000..2dc7299
--- /dev/null
+++ b/aoc22/day4/src/main.rs
@@ -0,0 +1,52 @@
+#![feature(iter_next_chunk)]
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let input = include_str!("../input");
+
+    let mut ans = 0;
+    for line in input.lines() {
+        let mut split = line
+            .split(',')
+            .flat_map(|elf| elf.split('-').flat_map(|x| x.parse::<u32>()));
+        let b1 = split.next().unwrap();
+        let e1 = split.next().unwrap();
+        let b2 = split.next().unwrap();
+        let e2 = split.next().unwrap();
+        let s1 = b1..=e1;
+        let s2 = b2..=e2;
+
+        if s1.contains(&b2) && s1.contains(&e2) || s2.contains(&b1) && s2.contains(&e1) {
+            ans += 1;
+        }
+    }
+
+    println!("{}", ans);
+}
+
+fn part2() {
+    let input = include_str!("../input");
+
+    let mut ans = 0;
+    for line in input.lines() {
+        let mut split = line
+            .split(',')
+            .flat_map(|elf| elf.split('-').flat_map(|x| x.parse::<u32>()));
+        let b1 = split.next().unwrap();
+        let e1 = split.next().unwrap();
+        let b2 = split.next().unwrap();
+        let e2 = split.next().unwrap();
+        let s1 = b1..=e1;
+        let s2 = b2..=e2;
+
+        if s1.contains(&b2) || s1.contains(&e2) || s2.contains(&b1) || s2.contains(&e1) {
+            ans += 1;
+        }
+    }
+
+    println!("{}", ans);
+}