题目：

 

 

解答：

 1 class Solution {
 2 public:
 3     vector<vector<int>> transpose(vector<vector<int>>& A) 
 4     {
 5         int ro = A.size();
 6         int co = A[0].size();
 7 
 8         vector<vector<int>> res(co);
 9         for (int i = 0; i < co; ++i) 
10         {
11             for (int j = 0; j < ro; ++j)
12             {
13                 res[i].emplace_back(A[j][i]);
14             }
15         }
16         return res;
17     }
18 };