convert to aoc-runner and day1 solutions

src/day6.rs

@@ -0,0 +1,74 @@
+use aoc_runner_derive::aoc;
+use itertools::Itertools;
+use std::io::BufRead;
+
+// PROBLEM 1 solution
+#[aoc(day6, part1)]
+fn part1(input: &[u8]) -> u64 {
+    let s = input.lines().next().unwrap().unwrap();
+    s.as_bytes()
+        .windows(4)
+        .enumerate()
+        .find_map(|(i, window)| {
+            if window[1..4].iter().all(|c| *c != window[0])
+                && window[2..4].iter().all(|c| *c != window[1])
+                && window[2] != window[3]
+            {
+                println!(
+                    "Unique window: {:?} at {}",
+                    window.iter().map(|c| *c as char).collect_vec(),
+                    i
+                );
+                Some(i + 4)
+            } else {
+                None
+            }
+        })
+        .unwrap() as u64
+}
+
+// PROBLEM 2 solution
+#[aoc(day6, part2)]
+fn part2(input: &[u8]) -> u64 {
+    let s = input.lines().next().unwrap().unwrap();
+    let size = 14;
+    s.as_bytes()
+        .windows(size)
+        .enumerate()
+        .find_map(|(i, window)| {
+            for i in 1..size {
+                let shifted = &window[i..];
+                if shifted.iter().enumerate().any(|(j, c)| *c == window[j]) {
+                    return None;
+                }
+            }
+            return Some(i + 14);
+        })
+        .unwrap() as u64
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::day6::*;
+
+    const EXAMPLE1: &[u8] = b"bvwbjplbgvbhsrlpgdmjqwftvncz";
+    const EXAMPLE2: &[u8] = b"nppdvjthqldpwncqszvftbrmjlhg";
+    const EXAMPLE3: &[u8] = b"nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg";
+    const EXAMPLE4: &[u8] = b"zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw";
+
+    #[test]
+    fn problem1_example() {
+        assert_eq!(part1(EXAMPLE1), 5);
+        assert_eq!(part1(EXAMPLE2), 6);
+        assert_eq!(part1(EXAMPLE3), 10);
+        assert_eq!(part1(EXAMPLE4), 11);
+    }
+
+    #[test]
+    fn problem2_example() {
+        assert_eq!(part2(EXAMPLE1), 23);
+        assert_eq!(part2(EXAMPLE2), 23);
+        assert_eq!(part2(EXAMPLE3), 29);
+        assert_eq!(part2(EXAMPLE4), 26);
+    }
+}