京东笔试题—集合问题

本地编译结果正确，在网上却说编译结果错误；求大牛看看哪有问题
#include<set>
#include<iostream>
using namespace std;
int main()
{
	set<int>set1;
  	int n,m,a,b;
  	cin>>n>>m;
  	for(int i =0;i<n;i++)
    {
      cin>>a;
  	  set1.insert(a);
    }
  	for(int j=0;j<m;j++)
    {
      cin>>b;
      set1.insert(b);
    }
  	set<int>::iterator  set1_iter;
  	for(set1_iter = set1.begin();set1_iter != set1.end();set1_iter++)
    {
    	cout<<*set1_iter<<" ";
    }
 	cout<<endl;
 
}