Day 2

02/part2.rs

@@ -0,0 +1,33 @@
+use std::collections::HashMap;
+use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::prelude::*;
+
+fn main() -> std::io::Result<()> {
+    let mut f = File::open("input")?;
+    let mut data = String::new();
+
+    f.read_to_string(&mut data)?;
+
+    for lineA in data.lines() {
+        for lineB in data.lines() {
+            let mut a = lineA.chars();
+            let mut b = lineB.chars();
+            let mut diffCount = 0;
+            let mut pairs = a.zip(b);
+
+            for (aChar, bChar) in pairs {
+                if aChar != bChar {
+                    diffCount += 1;
+                }
+            }
+
+            if diffCount == 1 {
+                println!("lineA: {} lineB: {}", lineA, lineB);
+            }
+        }
+    }
+
+    Ok(())
+}