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class Solution {
public:
    void rotate(vector<vector<int>>& 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++)
            reverse(matrix[i].begin(), matrix[i].end());
    }
};