Solution -「GXOI / GZOI 2019」AND OR Sum
DescriptionLink.给定一个 $N \times N$ 的矩阵,她希望求出:该矩阵的所有子矩阵的 $\texttt{AND}$ 值之和(所有子矩阵 $\texttt{AND}$ 值相...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.