Part 2 done

2022/rust/src/day3.rs

@@ -1,6 +1,7 @@
 mod common;
 
 use std::collections::HashSet;
+use std::iter::FromIterator;
 
 fn main() {
     let input = common::day_input(3);
@@ -33,11 +34,25 @@ fn part1(input: &str) -> i32 {
             n += 1
         }
     }
-    return r;
+    r
 }
 
 fn part2(input: &str) -> i32 {
-    0
+    let mut r = 0_i32;
+    for t in input.lines().collect::<Vec<&str>>().chunks_exact(3) {
+        let a: HashSet<u8> = HashSet::from_iter(t[0].bytes());
+        let b: HashSet<u8> = HashSet::from_iter(t[1].bytes());
+        let c: HashSet<u8> = HashSet::from_iter(t[2].bytes());
+        let ab = HashSet::from_iter(a.intersection(&b).cloned());
+        let b = ab.intersection(&c).next().unwrap();
+        if *b >= 97 && *b <= 122 {
+            r += (*b as i32) - 96;
+        } else {
+            r += (*b as i32) - 65 + 27;
+        }
+        println!("+{} = {}", b, r);
+    }
+    r
 }
 
 #[cfg(test)]
@@ -58,6 +73,6 @@ CrZsJsPPZsGzwwsLwLmpwMDw";
 
     #[test]
     fn test_part2() {
-        assert_eq!(part2(TEST_INPUT), 0)
+        assert_eq!(part2(TEST_INPUT), 70)
     }
 }