day 4: more type annotations

1 files changed, 2 insertions, 2 deletions

diff --git a/4.py b/4.py
index f08659b..eeb929e 100644
--- a/4.py
+++ b/4.py
@@ -10,7 +10,7 @@ class Board:
     has_bingo: bool
     unmarked_sum: int
     nums: set[int]
-    def __init__(self, cells: list[list[int]]):
+    def __init__(self, cells: list[list[int]]) -> None:
         self.width = len(cells[0])
         self.height = len(cells)
         self.col_hits = [0] * self.width
@@ -23,7 +23,7 @@ class Board:
             self.cells.append(cell)
             self.nums.add(cell)
         self.has_bingo = False
-    def call(self, num: int):
+    def call(self, num: int) -> None:
         if num not in self.nums: return
         pos: int = self.cells.index(num)
         self.col_hits[pos // self.width] += 1