#include<bits/stdc++.h>
using namespace std;
vector<int> v;
vector<int>::iterator it;
int main(){
    v.push_back(10);
    v.push_back(20);
    //容器为：10 20
	it=v.begin();
	cout<<*it<<" "<<*++it; 
	//为啥输出是两个20捏 
    return 0;
}

cout<<*it<<" ";
cout<<*++it; 
//输出改成这样就变成 10 20了 

求解! ! !