結果
| 問題 |
No.2731 Two Colors
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-04-19 22:31:37 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 936 ms / 3,000 ms |
| コード長 | 1,729 bytes |
| コンパイル時間 | 850 ms |
| コンパイル使用メモリ | 82,176 KB |
| 実行使用メモリ | 103,856 KB |
| 最終ジャッジ日時 | 2024-10-11 16:06:48 |
| 合計ジャッジ時間 | 14,505 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 33 |
ソースコード
import heapq
bit10 = (1 << 10) - 1
def solve(h, w, a):
col = [[-1] * w for _ in range(h)]
ans = 0
num = (a[0][0] << 20) | 0
queue0 = [num]
num = (a[h-1][w-1] << 20) | (h-1 << 10) | w-1
queue1 = [num]
while True:
ans += 1
filled = False
while True:
if queue0:
num = heapq.heappop(queue0)
i = (num >> 10) & bit10
j = num & bit10
if col[i][j] != -1:
continue
filled = True
col[i][j] = 0
for di, dj in [(1, 0), (-1, 0), (0, 1), (0, -1)]:
ni, nj = i + di, j + dj
if ni < 0 or ni >= h or nj < 0 or nj >= w:
continue
if col[ni][nj] == 0:
continue
elif col[ni][nj] == 1:
return ans - 2
else:
num = (a[ni][nj] << 20) | (ni << 10) | nj
heapq.heappush(queue0, num)
if filled:
break
ans += 1
while True:
if queue1:
num = heapq.heappop(queue1)
i = (num >> 10) & bit10
j = num & bit10
if col[i][j] != -1:
continue
filled = True
col[i][j] = 1
for di, dj in [(1, 0), (-1, 0), (0, 1), (0, -1)]:
ni, nj = i + di, j + dj
if ni < 0 or ni >= h or nj < 0 or nj >= w:
continue
if col[ni][nj] == 1:
continue
elif col[ni][nj] == 0:
return ans - 2
else:
num = (a[ni][nj] << 20) | (ni << 10) | nj
heapq.heappush(queue1, num)
if filled:
break
def main():
h, w = [int(x) for x in input().split()]
a = [[int(x) for x in input().split()] for _ in range(h)]
print(solve(h, w, a))
if __name__ == "__main__":
main()