我试图创建一个图形，我不知道它的大小，用户填充矢量，直到用户想要的。如何使用迭代器获取元素？
未完成的代码：

#include <iostream>
#include <vector>
#include <iterator>
#include <list>

void main(void)
{
    {
        using namespace std;
        
        vector<vector<char>> graph;
        vector<vector<char>>::iterator outerMove;
        vector<char>::iterator innerMover;
        cout << "enter your verteces name one by one and write done when you are done";
        for (outerMove = graph.begin(); outerMove != graph.end(); ++outerMove)
        {
            //first get the size of vector , how much user wants enters 
        }
        for (innerMover = )
        {
            //now here graph.push_back(innerMove) 
        }
}

谢谢你的帮助。