优先级队列-堆-STL实现

 #include <cstdio>
 #include <iostream>
 #include <queue>
 
 using namespace std;
 
 // 默认是最大堆
 //
 
 int main()
 {
     priority_queue<int> heap;
     heap.push();
     heap.push();
     heap.push();
     heap.push();
 
     while(!heap.empty())
     {
         cout<<heap.top()<<endl;
         heap.pop();
     }
 
     // 如何实现最小堆？
     priority_queue<int,vector<int>,greater<int>> heap2;
     heap2.push();
     heap2.push();
     heap2.push();
     heap2.push();
     heap2.push();
 
     while(!heap2.empty())
     {
         cout<<heap2.top()<<endl;
         heap2.pop();
     }
     return ;
 }