結果
| 問題 |
No.2456 Stamp Art
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-11-11 01:25:03 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 2,907 ms / 5,000 ms |
| コード長 | 1,929 bytes |
| コンパイル時間 | 599 ms |
| コンパイル使用メモリ | 82,560 KB |
| 実行使用メモリ | 280,160 KB |
| 最終ジャッジ日時 | 2024-11-11 01:25:48 |
| 合計ジャッジ時間 | 39,201 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 23 |
ソースコード
# https://yukicoder.me/problems/no/2456
def solve(H, W, S, replica_cells, k):
stamped_cell = [[0] * (W + 1) for _ in range(H + 1)]
for h in range(k, H + 1):
for w in range(k, W + 1):
b = replica_cells[h][w] - replica_cells[h - k][w] - replica_cells[h][w - k] + replica_cells[h - k][w - k]
if b == k ** 2:
stamped_cell[h][w] += 1
stamped_cell[h - k][w] -= 1
stamped_cell[h][w - k] -= 1
stamped_cell[h - k][w - k] += 1
for h in range(H + 1):
ans = 0
for w in reversed(range(W + 1)):
ans += stamped_cell[h][w]
stamped_cell[h][w] = ans
for w in range(W + 1):
ans = 0
for h in reversed(range(H + 1)):
ans += stamped_cell[h][w]
stamped_cell[h][w] = ans
for h in range(H):
for w in range(W):
if S[h][w] == "#" and stamped_cell[h + 1][w + 1] == 0:
return False
elif S[h][w] == "." and stamped_cell[h + 1][w + 1] > 0:
return False
return True
def main():
H, W = map(int, input().split())
S = []
for _ in range(H):
S.append(input())
replica_cells = [[0] * (W + 1) for _ in range(H + 1)]
for h in range(H):
for w in range(W):
if S[h][w] == "#":
replica_cells[h + 1][w + 1] = 1
for h in range(H):
row = 0
for w in range(W):
row += replica_cells[h + 1][w + 1]
replica_cells[h + 1][w + 1] = row + replica_cells[h][w + 1]
low = 1
high = min(H, W)
while high - low > 1:
mid = (high + low) // 2
if solve(H, W, S, replica_cells, mid):
low = mid
else:
high =mid
if solve(H, W, S, replica_cells, high):
print(high)
else:
print(low)
if __name__ == "__main__":
main()