Solution.cpp

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