牛客多校8a题补题 利用单调栈来求解（太菜了，继续加油把）

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

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