self.p_mat = [[0] * (len(matrix[0]) + 1) for i in range(len(matrix) + 1)] for i in range(len(matrix)): for j in range(len(matrix[0])): self.p_mat[i + 1][j + 1] = self ...
// matrix[i-1][j-1] 注意 matrix是0开始 preSum[i][j] = preSum[i - 1][j] + preSum[i][j - 1] - preSum[i - 1][j - 1] + matrix[i - 1][j - 1]; ...
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