#include<iostream>
using namespace std;

struct fcfs{
    int burst, arrival, id, completion;
};
fcfs meh[30];

class FCFS{
public:
    int n;
    void fcfsIn(){
        cout<<"\nEnter number of processes: ";
        cin>>n;
        for(int i = 0; i < n; i++){
            cout<<"\nEnter arrival time of P"<<i<<": ";
            cin>>meh[i].arrival;
            cout<<"\nEnter burst time of P"<<i<<": ";
            cin>>meh[i].burst;
            meh[i].id = i;
        }
        cout<<"\n  | Arrival | Burst\n";
        for(int j = 0; j < n; j++) {
            cout<<"P"<<j<<"| "<<meh[j].arrival<<"       | "<<meh[j].burst<<"\n";
        }
    }
    void process() {
        cout<<"\nSequence of processes is: ";
        int currentTime = 0;

        for(int i = 0; i < n; i++){
            if(currentTime < meh[i].arrival){
                while(currentTime < meh[i].arrival){
                    cout<<" NULL ";
                    currentTime++;
                }
            }

            cout<<"P"<<meh[i].id<<" ";
            currentTime += meh[i].burst;
            meh[i].completion = currentTime;
        }
    }

    void completion()
    {
        cout<<"\n\n  | Completion time\n";
        for(int j = 0; j < n; j++) {
            cout<<"P"<<j<<"| "<<meh[j].completion<<"\n";
        }
    }
};

int main()
{
    FCFS obj;
    obj.fcfsIn();
    obj.process();
    obj.completion();
    return 0;
}