import sys input = sys.stdin.readline N, M = map(int, input().split()) mtx = [] def shape1(i, j): r_0, r_90 = 0, 0 if j <= M - 4: r_0 = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i][j + 3] if i <= N - 4: r_90 = mtx[i][j] + mtx[i + 1][j] + mtx[i + 2][j] + mtx[i + 3][j] return max(r_0, r_90) def shape2(i, j): r_0 = 0 if i <= N - 2 and j <= M - 2: r_0 = mtx[i][j] + mtx[i][j + 1] + mtx[i + 1][j] + mtx[i + 1][j + 1] return r_0 def shape3(i, j): r_0, r_90, r_180, r_270 = 0, 0, 0, 0 r_0_decal, r_90_decal, r_180_decal, r_270_decal = 0, 0, 0, 0 if i <= N - 3 and j <= M - 2: r_0 = mtx[i][j] + mtx[i + 1][j] + mtx[i + 2][j] + mtx[i + 2][j + 1] if i <= N - 3 and j > 0: r_0_decal = mtx[i][j] + mtx[i + 1][j] + mtx[i + 2][j] + mtx[i + 2][j - 1] if i <= N - 2 and j <= M - 3: r_90 = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i + 1][j] if i > 0 and j <= M - 3: r_90_decal = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i - 1][j] if i <= N - 3 and j <= M - 2: r_180 = mtx[i][j] + mtx[i][j + 1] + mtx[i + 1][j + 1] + mtx[i + 2][j + 1] if i <= N - 3 and j > 0: r_180_decal = mtx[i][j] + mtx[i][j - 1] + mtx[i - 1][j - 1] + mtx[i + 2][j - 1] if i > 0 and j <= M - 3: r_270 = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i - 1][j + 2] if i <= N - 2 and j <= M - 3: r_270_rotate = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i + 1][j + 2] return max(r_0, r_90, r_180, r_270, r_0_decal, r_90_decal, r_180_decal, r_270_decal) def shape4(i, j): r_0, r_90 = 0, 0 r_0_decal, r_90_decal = 0, 0 if i <= N - 3 and j <= M - 2: r_0 = mtx[i][j] + mtx[i + 1][j] + mtx[i + 1][j + 1] + mtx[i + 2][j + 1] if i <= N - 3 and j > 0 : r_0_decal = mtx[i][j] + mtx[i + 1][j] + mtx[i + 1][j - 1] + mtx[i + 2][j - 1] if i > 0 and j <= M - 3: r_90 = mtx[i][j] + mtx[i][j + 1] + mtx[i - 1][j + 1] + mtx[i - 1][j + 2] if i <= N - 2 and j <= M - 3: r_90_decal = mtx[i][j] + mtx[i][j + 1] + mtx[i + 1][j + 1] + mtx[i + 1][j + 2] return max(r_0, r_90, r_0_decal, r_90_decal) def shape5(i, j): r_0, r_90, r_180, r_270 = 0, 0, 0, 0 if i <= N - 2 and j <= M - 3: r_0 = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i + 1][j + 1] if i > 0 and i <= N -2 and j <= M - 2: r_90 = mtx[i][j] + mtx[i][j + 1] + mtx[i - 1][j + 1] + mtx[i + 1][j + 1] if i > 0 and j <= M - 3: r_180 = mtx[i][j] + mtx[i][j + 1] + mtx[i][j + 2] + mtx[i - 1][j + 1] if i <= N - 3 and j <= M - 2: r_270 = mtx[i][j] + mtx[i + 1][j] + mtx[i + 2][j] + mtx[i + 1][j + 1] return max(r_0, r_90, r_180, r_270) for _ in range(N): mtx.append(list(map(int, input().split()))) max_sum = 0 for i in range(N): for j in range(M): max_sum = max(max_sum, shape1(i, j), shape2(i, j), shape3(i, j), shape4(i, j), shape5(i, j)) print(max_sum)

제출 #15921

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