Matrix means 867 LeetCode

Subject description:

code show as below:

class Solution {
public:
    vector<vector<int>> transpose(vector<vector<int>>& A) {
        vector<int>row;
        vector<vector<int>>res;
        for(int j=0;j<A[0].size();j++){
            for(int i=0;i<A.size();i++){
                row.push_back(A[i][j]);
            }
            res.push_back(row);
            row.clear();
        }
        return res;
    }
};