day2: both solutions first attempt

src/day2.rs

@@ -0,0 +1,74 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+use itertools::Itertools;
+use std::ops::RangeInclusive;
+
+#[aoc_generator(day2)]
+fn parse(input: &str) -> Vec<RangeInclusive<u64>> {
+    input
+        .split(',')
+        .map(|r| r.split_once('-').unwrap())
+        .map(|(start, end)| RangeInclusive::new(start.parse().unwrap(), end.parse().unwrap()))
+        .collect()
+}
+
+#[aoc(day2, part1, Brute)]
+fn part1(input: &[RangeInclusive<u64>]) -> u64 {
+    let mut invalid_sum = 0;
+
+    for r in input {
+        for product in r.clone() {
+            let prod_s = product.to_string();
+            if prod_s.len() % 2 != 0 {
+                continue;
+            }
+            let (left, right) = prod_s.split_at(prod_s.len() / 2);
+            if left == right {
+                invalid_sum += product
+            }
+        }
+    }
+    invalid_sum
+}
+
+#[aoc(day2, part2, Brute)]
+fn part2(input: &[RangeInclusive<u64>]) -> u64 {
+    let mut invalid_sum = 0;
+    for r in input {
+        for product in r.clone() {
+            let prod_s = product.to_string();
+            for n in 1..=prod_s.len() / 2 {
+                if prod_s.len() % n != 0 {
+                    continue;
+                }
+                if prod_s
+                    .chars()
+                    .chunks(n)
+                    .into_iter()
+                    .map(|c| c.collect::<String>())
+                    .all_equal()
+                {
+                    invalid_sum += product;
+                    break;
+                }
+            }
+        }
+    }
+    invalid_sum
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const EXAMPLE: &str = "11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124";
+
+    #[test]
+    fn part1_example() {
+        assert_eq!(part1(&parse(EXAMPLE)), 1227775554);
+    }
+
+    #[test]
+    fn part2_example() {
+        assert_eq!(part2(&parse(EXAMPLE)), 4174379265);
+    }
+}