矩阵tricks << Ashes of Time



矩阵tricks « Ashes of Time

In-place rotate matrix

一层一层的来

每一层，找到旋转中互换位置的4个点，然后循环进行。

 

已经排好序的矩阵里面找到某一个数

假设row和col都是从小到大排的序，那么从右上角开始，比当前元素大就下移一行，比当前元素小就左移一列。


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