hdu 4585 set应用

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
#include<set>
#define Maxn 100010
using namespace std;
struct Monk{
    int id,g;
    int operator <(const Monk &temp) const
    {
        return g<temp.g;
    }
};
multiset<Monk> q;
multiset<Monk> :: iterator it,it1;
int main()
{
    int n,i,j,g,k,x;
    Monk temp;
    while(scanf("%d",&n),n)
    {
        q.clear();
        temp.id=1,temp.g=1000000000;
        q.insert(temp);
        for(i=1;i<=n;i++)
        {
            scanf("%d%d",&k,&g);
            temp.id=k,temp.g=g;
            it=q.lower_bound(temp);
            if(it==q.begin())
            {
                printf("%d %d\n",k,it->id);
            }
            else{
                it1=it;
                it--;
                if(it1->g-g<g-it->g)
                {
                    printf("%d %d\n",k,it1->id);
                }
                else
                {
                    printf("%d %d\n",k,it->id);
                }
            }
            q.insert(temp);
        }
    }
    return 0;
}