vector >雙層vector使用

using namespace std;

vector<vector<string>>& vAllRow;
while(讀取數據到r中)
{
    vector<string> vRow;
    vRow.clear();
    
    vRow.push_back(r[0]);
    vRow.push_back(r[1]);
    vRow.push_back(r[2]);
    vRow.push_back(r[3]);
    vRow.push_back(r[4]);
    vRow.push_back(r[5]);
    
    vAllRow.push_back(vRow);
}
//數據存儲到了vAllRow中，下面將數據顯示出來
vector<vector<string>>::iterator item2v=vAllRow.begin();
while(item2v!=vAllRow.end())
{
    vector<string>::iterator item=(*item2v).begin();
    while(item!=(*item2v.end())
    {
        cout<<*item<<"\t";
        item++;
    }
    cout<<endl;
    item2v++;
}