結果
問題 | No.2731 Two Colors |
ユーザー | prd_xxx |
提出日時 | 2024-04-19 21:52:26 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 728 ms / 3,000 ms |
コード長 | 1,793 bytes |
コンパイル時間 | 294 ms |
コンパイル使用メモリ | 82,176 KB |
実行使用メモリ | 111,872 KB |
最終ジャッジ日時 | 2024-10-11 14:50:35 |
合計ジャッジ時間 | 11,976 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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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
H,W = map(int,input().split()) A = [list(map(int,input().split())) for i in range(H)] dij = [(0,1),(1,0),(0,-1),(-1,0)] import heapq C = [[-1]*W for _ in range(H)] C[0][0] = 1 C[H-1][W-1] = 0 hq1 = [] hq0 = [] for di,dj in dij: ni = 0 + di nj = 0 + dj if 0 <= ni < H and 0 <= nj < W: heapq.heappush(hq1, (A[ni][nj],ni*W+nj)) for di,dj in dij: ni = H-1 + di nj = W-1 + dj if 0 <= ni < H and 0 <= nj < W: heapq.heappush(hq0, (A[ni][nj],ni*W+nj)) added0 = [[0]*W for _ in range(H)] added1 = [[0]*W for _ in range(H)] for k in range(H*W+1): if k%2==0: while hq1: a,v = heapq.heappop(hq1) i,j = divmod(v,W) if C[i][j] != -1: continue C[i][j] = 1 for di,dj in dij: ni = i + di nj = j + dj if 0 <= ni < H and 0 <= nj < W: if C[ni][nj] == 0: print(k+1) exit() if C[ni][nj] == -1 and added1[ni][nj] == 0: heapq.heappush(hq1, (A[ni][nj],ni*W+nj)) added1[ni][nj] = 1 break else: while hq0: a,v = heapq.heappop(hq0) i,j = divmod(v,W) if C[i][j] != -1: continue C[i][j] = 0 for di,dj in dij: ni = i + di nj = j + dj if 0 <= ni < H and 0 <= nj < W: if C[ni][nj] == 1: print(k+1) exit() if C[ni][nj] == -1 and added0[ni][nj] == 0: heapq.heappush(hq0, (A[ni][nj],ni*W+nj)) added0[ni][nj] = 1 break