well that was easy

2021/src/day4.rs

@@ -191,8 +191,21 @@ fn part1(boards: &[Board]) -> eyre::Result<Board> {
 }
 
 
+fn part2(boards: &[Board]) -> eyre::Result<Board> {
+    let winner = boards.iter()
+        .filter(|b| b.bingo_time.is_some())
+        .max_by_key(|b| b.bingo_time.unwrap());
+
+    match winner {
+        Some(w) => Ok(*w),
+        None => Err(eyre!("Could not find a winning board")),
+    }
+}
+
+
 pub fn run(data: &str) -> eyre::Result<(isize, isize)> {
     let boards = load(data)?;
     let winner = part1(&boards)?;
-    Ok((winner.score()?, 0))
+    let loser = part2(&boards)?;
+    Ok((winner.score()?, loser.score()?))
 }