4492: 【例】迭代器-反向遍历vector

#include <bits/stdc++.h>
using namespace std;
int main(){
    int a[]={10,20,30,40,50};
    vector<int> v(a,a+5);
    //定义迭代器，命名为 it
    vector<int>::iterator it;
    //迭代器指向 vector<int>的首元素
    it =v.begin();
    (*it)++;
    cout<<*it<<" "<<v[0]<<endl;
    
    //利用迭代器循环遍历
    cout<<"迭代器遍历vector: ";
    for(it=v.begin();it<v.end();it=it+2){
        cout<<*it<<" ";
    }
    cout<<endl;
    
    //利用迭代器反向遍历 vector 
    cout<<"反向迭代器遍历vector: ";
    vector<int>::reverse_iterator rit;
    for(rit =v.rbegin();rit!=v.rend();rit++){
        cout<<*rit<<" ";
    }
    cout<<endl;
    return 0;
}