1std::vector<std::vector<int>> normal;
2for(int i=0; i<10; i++)
3{
4 //push a vector each time you loop a row
5 normal.push_back(std::vector<int>());
6 for(int j=0; j<20; j++)
7 {
8 //push an item each time you loop a column
9 normal[i].push_back(j);
10 }
11}