Day 6

src/day06.rs

@@ -0,0 +1,32 @@
+use aoc_runner_derive::aoc;
+
+fn check_unique(input: &[char]) -> bool {
+    for i in 0..input.len() - 1 {
+        if input[i + 1..input.len()].contains(&input[i]) {
+            return false;
+        }
+    }
+    true
+}
+
+#[aoc(day6, part1)]
+fn solve_part1(input: &str) -> usize {
+    let chars = input.chars().collect::<Vec<_>>();
+    for (i, window) in chars.windows(4).enumerate() {
+        if check_unique(window) {
+            return i + 4;
+        }
+    }
+    panic!();
+}
+
+#[aoc(day6, part2)]
+fn solve_part2(input: &str) -> usize {
+    let chars = input.chars().collect::<Vec<_>>();
+    for (i, window) in chars.windows(14).enumerate() {
+        if check_unique(window) {
+            return i + 14;
+        }
+    }
+    panic!();
+}

src/lib.rs

@@ -5,5 +5,6 @@ mod day02;
 mod day03;
 mod day04;
 mod day05;
+mod day06;
 
 aoc_lib! { year = 2022 }