LeetCode刷题记70

48. 旋转图像

题目

class Solution {
    public void rotate(int[][] matrix) {
        int n = matrix.length;
        for (int i = 0; i < n; i ++) {
            for (int j = 0; j < i; j ++) {
                int tmp = matrix[i][j];
                matrix[i][j] = matrix[j][i];
                matrix[j][i] = tmp;
            }
        }

        for (int i = 0; i < n; i ++) {
            for (int j = 0; j < (n + 1) / 2; j ++) {
                int tmp = matrix[i][j];
                matrix[i][j] = matrix[i][n - j - 1];
                matrix[i][n - j - 1] = tmp;
            }
        }
    }
}

2/5
70/150