2019牛客多校第八場——A. All-one Matrices【單調棧/思惟】【不可擴大的全1子矩陣個數】

連接：https://ac.nowcoder.com/acm/contest/888/Ac++ 題目描述 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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