摘要：
Write an algorithm such that if an element in an MxN matrix is 0, its entire row andcolumn is set to 0写一个算法使得把一个M*N的矩阵中0元素所在位置的行列设置为零At first glance, this problem seems easy: just iterate through the matrix and every time wesee a 0, set that row and column to 0 There’s one problem with that soluti.. 阅读全文
摘要：
Given an image represented by an NxN matrix, where each pixel in the imageis 4bytes, write a method to rotate the image by 90 degrees Can you do this in place?描述：给定一个N*N的图像，每个位置的像素是4byte，写一个方法用来在原来的空间内旋转图像90度。思路：我们可以按层来旋转。void matrixRotation(int [][]a,int n)
{ for(int layer=0;layer<n;layer++) {
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