leetcode-----48. 旋转图像

• 链接：https://leetcode-cn.com/problems/rotate-image/

代码

class Solution {
public:
    void rotate(vector>& matrix) {
        int n = matrix.size();
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < i; ++j) {
                swap(matrix[i][j], matrix[j][i]);
            }
        }

        for (int i = 0; i < n; ++i) {
            for (int j = 0, k = n - 1; j < k; j++, k--) {
                swap(matrix[i][j], matrix[i][k]);
            }
        }
    }
};