day 06

examples/day06_1.rs

@@ -0,0 +1,13 @@
+use std::collections::HashSet;
+
+fn main() {
+    let line = std::io::stdin().lines().next().unwrap().unwrap();
+    let chars: Vec<char> = line.chars().collect();
+    for (i, window) in chars.windows(4).enumerate() {
+        let set: HashSet<char> = HashSet::from_iter(window.iter().map(|x| *x));
+        if set.len() == 4 {
+            println!("{}", i + 4);
+            return
+        }
+    }
+}

examples/day06_2.rs

@@ -0,0 +1,13 @@
+use std::collections::HashSet;
+
+fn main() {
+    let line = std::io::stdin().lines().next().unwrap().unwrap();
+    let chars: Vec<char> = line.chars().collect();
+    for (i, window) in chars.windows(14).enumerate() {
+        let set: HashSet<char> = HashSet::from_iter(window.iter().map(|x| *x));
+        if set.len() == 14 {
+            println!("{}", i + 14);
+            return
+        }
+    }
+}