Rotate Image

class Solution {
public:
    void rotate(vector<vector<int> > &matrix) {
        int i=0, j=0, n=matrix.size();
        while(j<n/2) {
            for (i=0; i<n-2*j-1; i++) {
                int temp=matrix[i+j][j];
                matrix[i+j][j] = matrix[n-1-j][i+j];
                matrix[n-1-j][i+j] = matrix[n-1-i-j][n-1-j];
                matrix[n-1-i-j][n-1-j] = matrix[j][n-1-i-j];
                matrix[j][n-1-j-i] = temp;
            }
            j++;
        }
    }
};