fix day 4

2021/src/day4.rs

@@ -1,3 +1,4 @@
+use std::fmt;
 use color_eyre::eyre;
 use eyre::eyre;
 
@@ -127,6 +128,28 @@ impl Board {
     }
 }
 
+impl fmt::Display for Board {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        for row in self.squares {
+            write!(f, "|")?;
+            for (i, sq) in row.iter().enumerate() {
+                let dt = sq.draw_time.map(|dt| format!("{}", dt)).unwrap_or(String::from("__"));
+                write!(f, "({}: {})", sq.value, dt)?;
+                if i < 4 {
+                    write!(f, ", ")?;
+                }
+            }
+            write!(f, "|\n")?;
+        }
+        if self.bingo_time.is_some() {
+            write!(f, "Bingo: ({}: {})", self.bingo_value.unwrap(), self.bingo_time.unwrap())
+        }
+        else {
+            write!(f, "Bingo: (__: __)")
+        }
+    }
+}
+
 
 fn load(data: &str) -> eyre::Result<Vec<Board>> {
     let mut lines = data.lines().peekable();
@@ -147,6 +170,7 @@ fn load(data: &str) -> eyre::Result<Vec<Board>> {
         if squares.len() == 25 {
             boards.push(Board::from(&squares)?);
             boards.last_mut().unwrap().set_bingo();
+            squares.clear();
         }
     }