c – 取消引用向量的结束迭代器时打印的奇数值

#include<iostream>
#include<iterator>
#include<set>
#include<map>
int main()
{
    int a[] = {1,5};
    std::set<int> set1(a,a+sizeof(a)/sizeof(int));
    for (std::set<int>::iterator itr=set1.begin();itr!=set1.end();++itr){
        std::cout << *itr << std::endl;
    }
    //std::pair<std::set<int>::iterator,bool> ret;
    //ret = set1.insert(1);
    //std::cout << *(ret.first) << "first;second" << ret.second << std::endl;
    std::set<int>::iterator itr1 = set1.begin();
    set1.insert(itr1,100);
    std::advance(itr1,3);
    std::cout << *itr1 << std::endl;
    std::cout << *(set1.find(500)) << std::endl;
    std::cout << *(set1.end()) << std::endl;
}