multiset<int> ms;
ms.insert(3);
ms.insert(3);
ms.insert(1);
ms.insert(4);
//erase(i)会返回移除的数字的个数，并且multiset的长度会发生改变
for(multiset<int>::iterator it = ms.begin(); it!=ms.end(); it++){
    cout<<ms.erase(3)<<endl;
    cout<<ms.count(3)<<endl;
    cout<<*it<<endl;
}

bitset<33> var;
var[0] = 1;
cout<<var<<endl;

multimap<int, int> mp;
mp.insert(make_pair(1, 2));
//cout<<mp.count(1)<<endl;
mp.insert(make_pair(1, 3));
//cout<<mp.count(1)<<endl;
//mp.insert(make_pair(2, 4));
//查询一个区间的有相同的键的所有的值
multimap<int, int>::iterator it = mp.lower_bound(1);
multimap<int, int>::iterator it1 = mp.lower_bound(2);
while(it!=it1){
    cout<<it->second<<endl;
    it++;
}