luogu P3378 堆模板

Posted 2020-10-25 Misaka_Azusa

题目链接：https://www.luogu.org/problemnew/show/P3378

是堆的模板...我懒，STL da fa is good

#include <iostream>
#include <cstdio>
#include <queue>
#include <algorithm>
using namespace std;
priority_queue<int,vector<int>,greater<int> > qqq;//小根堆
//priority_queue<int> qqq;//大根堆 
int ans[1000001];
int k,x,cnt=1;
int main()
{
    int n;
    cin>>n;
    for(int i = 1; i <= n; i++)
    {
        cin>>k;
        if(k == 1)
        {
            cin>>x;
            qqq.push(x);    
        }
        if(k == 2)
        {
            ans[cnt]=qqq.top();
            cnt++;
        }
        if(k == 3)
        {
            qqq.pop();
        }
        
    }
    /*while(!qqq.empty())
    {
        int x=qqq.top();
        cout<<x<<" ";
        qqq.pop();
    }都可以用来输出*/
    for(int i = 1; i < cnt; i++)
    {
        cout<<ans[i]<<endl;
    }
    return 0;
}