hdu(4006)优先队列求第K大的数

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <queue>
#include <vector>
using namespace std;
int main()
{
    int n,k;
    while(scanf("%d %d",&n,&k) == 2)
    {
        priority_queue<int,vector<int>,greater<int> > Q;//min-->max
        for(int i = 1;i <= n;i++)
        {
            char opt[20];
            scanf(" %s",opt);
            if(opt[0] == 'I')
            {
                int a;
                scanf("%d",&a);
                Q.push(a);
                if(Q.size() > k)
                    Q.pop();
            }
            else
                printf("%d\n",Q.top());
        }
    }
}