Add day 2

AoC_2025/src/days/day02.rs

@@ -0,0 +1,51 @@
+use crate::days::Solution;
+
+pub struct Day02;
+
+impl Solution for Day02 {
+    type Input = Vec<(usize, usize)>;
+
+    fn parse(&self, data: &str) -> Self::Input {
+        data.split("\n")
+            .next()
+            .unwrap()
+            .split(",")
+            .map(|s| {
+                let mut ints = s.split("-").map(|x| x.parse::<usize>());
+                (ints.next().unwrap().unwrap(), ints.next().unwrap().unwrap())
+            })
+            .collect()
+    }
+
+    fn part1(&self, input: &Self::Input) -> usize {
+        input
+            .iter()
+            .map(|(start, end)| {
+                (*start..=*end)
+                    .map(|x| x.to_string())
+                    .filter(|s| {
+                        let len = s.len();
+                        len % 2 == 0 && s[..len / 2] == s[len / 2..]
+                    })
+                    .map(|s| s.parse::<usize>().unwrap())
+                    .sum::<usize>()
+            })
+            .sum()
+    }
+
+    fn part2(&self, input: &Self::Input) -> usize {
+        input
+            .iter()
+            .map(|(start, end)| {
+                (*start..=*end)
+                    .map(|x| x.to_string())
+                    .filter(|s| {
+                        let len = s.len();
+                        (1..=len / 2).any(|n| len % n == 0 && s == &s[..n].repeat(len / n))
+                    })
+                    .map(|s| s.parse::<usize>().unwrap())
+                    .sum::<usize>()
+            })
+            .sum()
+    }
+}