Leetcode: Rotate Image
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You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:
Could you do this in-place?
基本思想就是转圈一个个的替换,不过各个坐标转换的真是晕菜呀。。。
class Solution {public: void rotate(vector<vector<int> > &matrix) { int size = matrix.size(); int level = size / 2; for (int i = 0; i < level; ++i) { for (int j = i; j < size - i - 1; ++j) { int tmp = matrix[i][j]; matrix[i][j] = matrix[size-j-1][i]; matrix[size-j-1][i] = matrix[size-i-1][size-j-1]; matrix[size-i-1][size-j-1] = matrix[j][size-i-1]; matrix[j][size-i-1] = tmp; } } }};
=============第二次===============
class Solution {public: void rotate(vector<vector<int> > &matrix) { int size = matrix.size() - 1; int start = 0; int end = matrix.size() - 1; for (int i = 0; i < matrix.size() / 2; ++i) { for (int j = start; j < end; ++j) { int tmp = matrix[i][j]; matrix[i][j] = matrix[size-j][i]; matrix[size-j][i] = matrix[size-i][size-j]; matrix[size-i][size-j] = matrix[j][size-i]; matrix[j][size-i] = tmp; } ++start; --end; } }};
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