結果
| 問題 |
No.2731 Two Colors
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-04-20 16:01:03 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 1,601 ms / 3,000 ms |
| コード長 | 1,578 bytes |
| コンパイル時間 | 427 ms |
| コンパイル使用メモリ | 82,560 KB |
| 実行使用メモリ | 120,232 KB |
| 最終ジャッジ日時 | 2024-10-12 11:44:31 |
| 合計ジャッジ時間 | 20,520 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 33 |
ソースコード
from heapq import heappop, heappush
H, W = map(int, input().split())
A = [list(map(int, input().split())) for _ in range(H)]
di, dj = [1, 0, -1, 0], [0, 1, 0, -1]
hq1 = []
hq2 = []
C = [[-1] * W for _ in range(H)]
C[0][0] = 0
C[-1][-1] = 1
add1 = [[False] * W for _ in range(H)]
add2 = [[False] * W for _ in range(H)]
for d in range(4):
ni, nj = di[d], dj[d]
if 0 <= ni < H and 0 <= nj < W:
add1[ni][nj] = True
heappush(hq1, (A[ni][nj], ni, nj))
for d in range(4):
ni, nj = H - 1 + di[d], W - 1 + dj[d]
if 0 <= ni < H and 0 <= nj < W:
add2[ni][nj] = True
heappush(hq2, (A[ni][nj], ni, nj))
ans = 1
while hq1 and hq2:
if ans & 1:
v, i, j = heappop(hq1)
C[i][j] = 0
for d in range(4):
ni, nj = i + di[d], j + dj[d]
if 0 <= ni < H and 0 <= nj < W and C[ni][nj] != -1 and C[ni][nj] != C[i][j]:
print(ans)
exit()
if 0 <= ni < H and 0 <= nj < W and C[ni][nj] == -1 and not add1[ni][nj]:
add1[ni][nj] = True
heappush(hq1, (A[ni][nj], ni, nj))
else:
v, i, j = heappop(hq2)
C[i][j] = 1
for d in range(4):
ni, nj = i + di[d], j + dj[d]
if 0 <= ni < H and 0 <= nj < W and C[ni][nj] != -1 and C[ni][nj] != C[i][j]:
print(ans)
exit()
if 0 <= ni < H and 0 <= nj < W and C[ni][nj] == -1 and not add2[ni][nj]:
add2[ni][nj] = True
heappush(hq2, (A[ni][nj], ni, nj))
ans += 1
assert 0