[LeetCode]Rotate Image

    public void rotate1(int[][] matrix) {//找出对应关系（i,j） -> (j,n-1-i)
        int n = matrix.length;
        int [][]tmp = new int[n][n];
        for(int i = 0; i < n; ++ i){
            for(int j =0; j < n; ++ j){
                tmp[j][n-i-1] = matrix[i][j];
            }
        }
        for(int i = 0; i < n; ++ i){
            for(int j =0; j < n; ++ j){
                matrix[i][j] = tmp[i][j];
            }
        }

     }

    public void rotate(int[][] matrix) {//inplace (i,j)->(j,i) reverse(每一行)
        int n = matrix.length;
        int temp;
        for(int i = 0; i < n; ++ i){
            for(int j =i; j < n; ++ j){
                temp = matrix[i][j];
                matrix[i][j] = matrix[j][i];
                matrix[j][i] = temp;
            }
        }

        int l,r;
        for(int i = 0;i < n; ++i){
            l = 0;
            r = n-1;
            while (l < r){
                temp = matrix[i][l];
                matrix[i][l] = matrix[i][r];
                matrix[i][r] = temp;
                l ++;
                r --;
            }
        }
    }

[LeetCode]Rotate Image

原文：http://blog.csdn.net/youmengjiuzhuiba/article/details/44901461