priority_queue

 #include<iostream>

#include<queue>

#include<vector>

using namespace std;

int main(){

    // priority_queue<int> q;

    // priority_queue<int, vector<int>, greater<int>> q;

    auto cmp=[](int a, int b){

        return a<b;

    };

    priority_queue<int, vector<int>, decltype(cmp)>q(cmp);

   

    vector<int> v={8, 1, 6, 4, 0, 7, 2, 9};

    for(int x: v) q.push(x);

    while(!q.empty()){

        cout<<q.top()<<" ";

        q.pop();

    }

    cout<<endl;

    return 0;

}