2019牛客多校第八场——A. All-one Matrices【单调栈/思惟】【不可扩大的全1子矩阵个数】

连接：https://ac.nowcoder.com/acm/contest/888/Ac++ 题目描述 Gromah and LZR entered the great tomb, the first thing they see is a matrix of size n×mn\times mn×m, and the elements in the matrix are all 00_{}0​

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