priority cpu os schedule

/*
5
3 10
1 1
4 2
5 1
2 5
*/

/*
Enter The process Number
4
Enter The priority Number and burst time
3 20
2 5
10 7
4 15
Top value pq: 2-> Position : 2-> Start time : 0 -> Finish time : 5
Top value pq: 3-> Position : 1-> Start time : 5 -> Finish time : 25
Top value pq: 4-> Position : 4-> Start time : 25 -> Finish time : 40
Top value pq: 10-> Position : 3-> Start time : 40 -> Finish time : 47
Avg Waiting time : 17.5
Avg Turn around time : 29.25
Throughput : 0.034188
*/
#include<bits/stdc++.h>
using namespace std;
priority_queue <pair<int,pair<int,int > > >pq;
int main()
{
    int num,bt,prior,waiting=0,turnaround=0;
    cout<<"Enter The process Number "<<endl;
    cin>>num;
    cout<<"Enter The priority Number and burst time "<<endl;
    int ans[num+10],totaltime=0,sumtime=0;
    for (int i=0; i<num; i++)
    {
        cin>>prior>>bt;
        pq.push(make_pair(-1*prior,make_pair(bt,i))) ;
    }


    while(!pq.empty())
    {
        pair<int,pair<int,int> >t=pq.top();
        int pos=t.second.second;
        totaltime=t.second.first;
        cout<<"Top value pq: "<<-1*t.first<<"-> Position : "<<pos+1<<"-> Start time : "<<sumtime<<" ";
        waiting=waiting+sumtime;
        sumtime=sumtime+totaltime;
        cout<<"-> Finish time : "<<sumtime<<endl;
        turnaround=turnaround+sumtime;

        pq.pop();

    }
    cout<<"Avg Waiting time : "<<1.0* waiting/num<<endl;
    cout<<"Avg Turn around time : "<<1.0*turnaround/num<<endl;
    cout<<"Throughput : "<<1.0*num/turnaround<<endl;

}