2019牛客暑期多校訓練營（第八場）

All-one Matrices 連接：https://ac.nowcoder.com/acm/contest/888/A 來源：牛客網html 題目描述 Gromah and LZR entered the great tomb, the first thing they see is a matrix of size n × m n×m n×m times mn×m, and the elem

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