aoc2022 day 04

src/aoc2022/day04/mod.rs

@@ -0,0 +1,61 @@
+struct Assignment {
+    lower_border: usize,
+    upper_border: usize,
+}
+
+impl Assignment {
+    fn contains(&self, other: &Assignment) -> bool {
+        self.lower_border <= other.lower_border && self.upper_border >= other.upper_border
+    }
+
+    fn overlaps(&self, other: &Assignment) -> bool {
+        let overlaps_lower = other.upper_border >= self.lower_border && other.upper_border <= self.lower_border;
+        let overlaps_upper = other.lower_border >= self.lower_border && other.lower_border <= self.upper_border;
+
+        overlaps_lower || overlaps_upper
+    }
+
+    fn parse(input: &str) -> Assignment {
+        match input.trim().split_once("-") {
+            Some((low, upp)) => Assignment {
+                lower_border: low.parse::<usize>().unwrap(),
+                upper_border: upp.parse::<usize>().unwrap(),
+            },
+            None => panic!(),
+        }
+    }
+}
+
+pub fn task_one(input: &str) -> String {
+    let mut count = 0;
+
+    for line in input.lines() {
+        if let Some((first, second)) = line.split_once(",") {
+            let first = Assignment::parse(first);
+            let second = Assignment::parse(second);
+
+            if first.contains(&second) || second.contains(&first) {
+                count += 1;
+            }
+        }
+    }
+
+    count.to_string()
+}
+
+pub fn task_two(input: &str) -> String {
+    let mut count = 0;
+
+    for line in input.lines() {
+        if let Some((first, second)) = line.split_once(",") {
+            let first = Assignment::parse(first);
+            let second = Assignment::parse(second);
+
+            if first.overlaps(&second) || second.overlaps(&first) {
+                count += 1;
+            }
+        }
+    }
+
+    count.to_string()
+}

src/aoc2022/mod.rs

@@ -1,3 +1,4 @@
 pub mod day01;
 pub mod day02;
 pub mod day03;
+pub mod day04;

src/main.rs

@@ -45,4 +45,7 @@ fn main() {
 
     puzzle = Puzzle { day: 3, year: 2022, task_one: aoc2022::day03::task_one, task_two: aoc2022::day03::task_two };
     puzzle.solve_and_print();
+
+    puzzle = Puzzle { day: 4, year: 2022, task_one: aoc2022::day04::task_one, task_two: aoc2022::day04::task_two };
+    puzzle.solve_and_print();
 }