diff --git a/2022/rust/src/day4.rs b/2022/rust/src/day4.rs
index 1300d6d..32917ca 100644
--- a/2022/rust/src/day4.rs
+++ b/2022/rust/src/day4.rs
@@ -6,47 +6,32 @@ fn main() {
     println!("Part 2: {}", part2(&input));
 }
 
-fn part1(input: &str) -> i32 {
-    let mut r = 0;
-    for l in input.lines() {
-        let mut c = l.split(",");
-        let p1 = c.next().unwrap();
-        let p2 = c.next().unwrap();
-        let mut p1c = p1.split("-");
-        let p1n1 = p1c.next().unwrap().parse::<i32>().unwrap();
-        let p1n2 = p1c.next().unwrap().parse::<i32>().unwrap();
-        let mut p2c = p2.split("-");
-        let p2n1 = p2c.next().unwrap().parse::<i32>().unwrap();
-        let p2n2 = p2c.next().unwrap().parse::<i32>().unwrap();
+fn nums(input: &str) -> Vec<i32> {
+    input
+        .replace(",", "-")
+        .split("-")
+        .map(|s| s.parse::<i32>().unwrap())
+        .collect()
+}
 
-        if (p1n1 <= p2n1 && p1n2 >= p2n2) || (p2n1 <= p1n1 && p2n2 >= p1n2) {
-            r += 1
-        }
-    }
-    r
+fn part1(input: &str) -> i32 {
+    input
+        .lines()
+        .map(|l| {
+            let n = nums(l);
+            ((n[0] <= n[2] && n[1] >= n[3]) || (n[2] <= n[0] && n[3] >= n[1])) as i32
+        })
+        .sum()
 }
 
 fn part2(input: &str) -> i32 {
-    let mut r = 0;
-    for l in input.lines() {
-        println!("{}", l);
-        let mut c = l.split(",");
-        let p1 = c.next().unwrap();
-        let p2 = c.next().unwrap();
-        let mut p1c = p1.split("-");
-        let x1 = p1c.next().unwrap().parse::<i32>().unwrap();
-        let x2 = p1c.next().unwrap().parse::<i32>().unwrap();
-        let mut p2c = p2.split("-");
-        let y1 = p2c.next().unwrap().parse::<i32>().unwrap();
-        let y2 = p2c.next().unwrap().parse::<i32>().unwrap();
-
-        println!("{}-{} , {}-{}", x1, x2, y1, y2);
-        if x1 <= y2 && y1 <= x2 {
-            r += 1;
-            println!("overlap");
-        }
-    }
-    r
+    input
+        .lines()
+        .map(|l| {
+            let n = nums(l);
+            (n[0] <= n[3] && n[2] <= n[1]) as i32
+        })
+        .sum()
 }
 
 #[cfg(test)]