牛客多校8a題補題 利用單調棧來求解（太菜了，繼續加油把）

連接：https://ac.nowcoder.com/acm/contest/888/A 來源：牛客網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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