Syncing z2

2021/04-1.py

@@ -0,0 +1,49 @@
+class Board:
+    def __init__(self, board):
+        self.board = board
+        self.width = len(self.board[0])
+        self.height = len(self.board)
+        self.matches = [[False] * self.width for _ in range(self.height)]
+        self.last_number = 0
+
+    def check_number(self, number):
+        self.last_number = number
+        for i in range(self.width):
+            for j in range(self.height):
+                if self.board[i][j] == number:
+                    self.matches[i][j] = True
+
+    def check_win(self):
+        return (any(all(row) for row in self.matches) or
+                any(all(col) for col in zip(*self.matches)))
+
+    def sum_score(self):
+        match_sum = 0
+        for i in range(self.width):
+            for j in range(self.height):
+                if not self.matches[i][j]:
+                    match_sum += int(self.board[i][j])
+        return match_sum
+
+
+with open('2021/04.input') as f:
+    numbers, *boards = f.read().rstrip().split('\n\n')
+
+numbers = [int(num) for num in numbers.split(',')]
+
+boards = [[line.split() for line in board.split('\n')] for board in boards]
+boards = [[[int(elt) for elt in line] for line in board] for board in boards]
+boards = [Board(board) for board in boards]
+
+winners = []
+for number in numbers:
+    for i in range(len(boards) - 1, -1, -1):
+        boards[i].check_number(number)
+        if boards[i].check_win():
+            winners.append(boards[i])
+            boards.pop(i)
+
+first = winners[0]
+last = winners[-1]
+print(first.sum_score() * first.last_number)
+print(last.sum_score() * last.last_number)