LeetCode: Rotate Image

好麻烦的一道题，完全是算术。。少数次过

class Solution {
public:
    void rotate(vector<vector<int> > &matrix) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        int n = matrix.size();
        for (int i = 0; i < n/2; i++) {
            for (int j = i; j < n-1-i; j++) {
                int tmp = matrix[i][j];
                matrix[i][j] = matrix[n-1-j][i];
                matrix[n-1-j][i] = matrix[n-1-i][n-1-j];
                matrix[n-1-i][n-1-j] = matrix[j][n-1-i];
                matrix[j][n-1-i] = tmp;
            }
        }
    }
};

 C#

public class Solution {
    public void Rotate(int[,] matrix) {
        int n = matrix.GetLength(0);
        for (int i = 0; i < n/2; i++) {
            for (int j = i; j < n-1-i; j++) {
                int tmp = matrix[i, j];
                matrix[i, j] = matrix[n-1-j, i];
                matrix[n-1-j, i] = matrix[n-1-i, n-1-j];
                matrix[n-1-i, n-1-j] = matrix[j, n-1-i];
                matrix[j, n-1-i] = tmp;
            }
        }
    }
}