1 files changed, 68 insertions, 0 deletions
diff --git a/2022/Rust/src/day4.rs b/2022/Rust/src/day4.rs
new file mode 100644
index 0000000..ca50935
--- /dev/null
+++ b/2022/Rust/src/day4.rs
@@ -0,0 +1,68 @@
+use std::{num::ParseIntError, str::FromStr};
+
+#[derive(Debug)]
+struct Rng {
+    start: usize,
+    end: usize,
+}
+
+impl Rng {
+    fn intersects(&self, rng: &Rng) -> bool {
+        if self.start <= rng.end && rng.start <= self.end {
+            return true;
+        }
+        false
+    }
+
+    fn contains(&self, rng: &Rng) -> bool {
+        if self.start >= rng.start && self.end <= rng.end {
+            true
+        } else {
+            false
+        }
+    }
+}
+
+impl FromStr for Rng {
+    type Err = ParseIntError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (start, end) = s.split_once('-').unwrap();
+        let start_fromstr = start.parse::<usize>()?;
+        let end_fromstr = end.parse::<usize>()?;
+        Ok(Rng {
+            start: start_fromstr,
+            end: end_fromstr,
+        })
+    }
+}
+
+fn solve_part_one(data: &str) -> u32 {
+    data.lines()
+        .map(|line| -> u32 {
+            let l = line.split_once(',').unwrap();
+            let r1 = Rng::from_str(l.0).unwrap();
+            let r2 = Rng::from_str(l.1).unwrap();
+            (r1.contains(&r2) || r2.contains(&r1)) as u32
+        })
+        .sum()
+}
+
+fn solve_part_two(data: &str) -> u32 {
+    data.lines()
+        .map(|line| -> (Rng, Rng) {
+            let l = line.split_once(',').unwrap();
+            (Rng::from_str(l.0).unwrap(), Rng::from_str(l.1).unwrap())
+        })
+        .map(|rngs| rngs.0.intersects(&rngs.1) as u32)
+        .sum()
+}
+
+fn main() {
+    let data_test = include_str!("../data/day4.test");
+    let data_prod = include_str!("../data/day4.prod");
+    println!("{}", solve_part_one(data_test));
+    println!("{}", solve_part_two(data_test));
+    println!("{}", solve_part_one(data_prod));
+    println!("{}", solve_part_two(data_prod));
+}