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class Solution {
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 public:
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  vector<vector<int>> transpose(vector<vector<int>> &matrix) {
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    int row = matrix.size();
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    int col = matrix[0].size();
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    vector<vector<int>> result(col, vector<int>(row, 0));
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    for (int i = 0; i < col; ++i) {
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      for (int j = 0; j < row; ++j) {
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        result[i][j] = matrix[j][i];
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      }
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    }
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    return result;
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  }
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};