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#include <iostream>
using namespace std;

void findWaitingTime(int processes[], int n, int bt[], int wt[], int quantum) {
    int rem_bt[n]; // Remaining burst time for each process
    for (int i = 0; i < n; i++)
        rem_bt[i] = bt[i];

    int t = 0; // Current time
    while (true) {
        bool done = true;
        for (int i = 0; i < n; i++) {
            if (rem_bt[i] > 0) {
                done = false; // There is a pending process
                if (rem_bt[i] > quantum) {
                    t += quantum;
                    rem_bt[i] -= quantum;
                } else { // If remaining time is less than or equal to quantum
                    t += rem_bt[i];
                    wt[i] = t - bt[i];
                    rem_bt[i] = 0; // Process is completed
                }
            }
        }
        if (done)
            break;
    }
}

void findTurnaroundTime(int processes[], int n, int bt[], int wt[], int tat[]) {
    for (int i = 0; i < n; i++)
        tat[i] = bt[i] + wt[i];
}

void findAvgTime(int processes[], int n, int bt[], int quantum) {
    int wt[n], tat[n], total_wt = 0, total_tat = 0;

    findWaitingTime(processes, n, bt, wt, quantum);
    findTurnaroundTime(processes, n, bt, wt, tat);

    cout << "PN\tBT\tWT\tTAT\n";
    for (int i = 0; i < n; i++) {
        total_wt += wt[i];
        total_tat += tat[i];
        cout << "P" << processes[i] << "\t" << bt[i] << "\t" << wt[i] << "\t" << tat[i] << endl;
    }

    cout << "Average waiting time: " << (float)total_wt / n << endl;
    cout << "Average turnaround time: " << (float)total_tat / n << endl;
}

int main() {
    int n;

    // User input for number of processes
    cout << "Enter the number of processes: ";
    cin >> n;

    int processes[n], burst_time[n];

    // User input for process IDs and burst times
    cout << "Enter the burst times for each process:\n";
    for (int i = 0; i < n; i++) {
        processes[i] = i; // Assign process IDs as 0, 1, ..., n-1
        cout << "Burst time for Process " << processes[i] << ": ";
        cin >> burst_time[i];
    }

    int quantum;
    
    // User input for time quantum
    cout << "Enter the time quantum: ";
    cin >> quantum;

    findAvgTime(processes, n, burst_time, quantum);
    
    return 0;
}