day 6

day6/src/main.rs

@@ -0,0 +1,38 @@
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::{prelude::*, BufReader};
+
+fn main() -> std::io::Result<()> {
+    //Read in file
+    let file = File::open("input")?;
+    let reader = BufReader::new(file);
+
+    reader.lines().enumerate().for_each(|(line_no, line)| {
+        let line = line.unwrap();
+        'checker: for i in 4..line.len() {
+            let window = line[(i - 4)..i].to_string();
+            let mut holder: HashMap<char, bool> = HashMap::new();
+            for c in window.chars() {
+                if holder.contains_key(&c) {
+                    continue 'checker;
+                }
+                holder.insert(c, true);
+            }
+            println!("Part 1: line: {} marker at: {}", line_no, i);
+            break;
+        }
+        'checker: for i in 14..line.len() {
+            let window = line[(i - 14)..i].to_string();
+            let mut holder: HashMap<char, bool> = HashMap::new();
+            for c in window.chars() {
+                if holder.contains_key(&c) {
+                    continue 'checker;
+                }
+                holder.insert(c, true);
+            }
+            println!("Part 2: line: {} marker at: {}", line_no, i);
+            break;
+        }
+    });
+    Ok(())
+}