优先队列

    priority_queue<int>que;  //默认从大到小排列
    
    
    priority_queue<int ,vector<int>,cmp>que;
struct cmp
{
    bool operator ()(int &a,int &b)
    {
        return a>b;
    }
};       //采用自定义的方式来排列


    
#include<functional>
    priority_queue<int ,vector<int>,greater<int>>que;