leetcode || 48、Rotate Image

problem：

thinking：

（1）题目要求原址操作

（2）先将矩阵 转置，再将矩阵沿中间对称左右翻转

code：

class Solution {
public:
    void rotate(vector<vector<int> > &matrix) {
        int dim = matrix.size();
        int temp = 0;
        for (int i = 0; i < dim; ++i) { //转置
            for (int j = i+1; j < dim; ++j) {
                temp = matrix[i][j];
                matrix[i][j] = matrix[j][i];
                matrix[j][i] = temp;
            }
        }
        for (int i = 0; i < dim/2; ++i) { //对称变换
            for (int j = 0; j < dim; ++j) {
                temp = matrix[j][i];
                matrix[j][i] = matrix[j][dim - i -1];
                matrix[j][dim - i -1] = temp;
            }
        }
    }
};

leetcode || 48、Rotate Image

原文：http://blog.csdn.net/hustyangju/article/details/44753005