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