[HackerEarth] You are given a NxM matrix consisting of 0s and 1s. Find the number of square frames with no 1s (each cell is 0) in this matrix. A frame of a fixed square is a group of cells each of th - 题解

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题目信息
题号 P16818
标题 [HackerEarth] You are given a NxM matrix consisting of 0s and 1s. Find the number of square frames with no 1s (each cell is 0) in this matrix. A frame of a fixed square is a group of cells each of th
难度 提高
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