RT：

#include<bits/stdc++.h>
using namespace std;
multiset<int>s;
multiset<int>::iterator it;
int n;
int in;
int tt;
int main(){	
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin>>n;
	for(register int i=1;i<=n;++i){
		cin>>in;
		s.insert(in);
	}
	for(it=s.begin();it!=s.end();++it){
		tt=*it;
		if(count(tt)%2!=0){
			cout<<tt;
		}
	} 
	return 0;
}

编译的时候出现了： [Error] no matching function for call to 'count(int&)' [Error] candidate is: 4582 5 c:\program files (x86)\dev-cpp\mingw32\lib\gcc\mingw32\4.6.2\include\c++\bits\stl_algo.h template<class _IIter, class _Tp> typename std::iterator_traits<_InputIterator>::difference_type std::count(_IIter, _IIter, const _Tp&)

语法问题 \>=</