os-lab-program-c++ program to shortest job first(SJF)

#include <iostream>
using namespace std;
int mat[10][6];
 
void swap(int* a, int* b)
{
    int temp = *a;
    *a = *b;
    *b = temp;
}
 
void arrangeArrival(int num, int mat[][6])
{
    for (int i = 0; i < num; i++) {
        for (int j = 0; j < num - i - 1; j++) {
            if (mat[j][1] > mat[j + 1][1]) {
                for (int k = 0; k < 5; k++) {
                    swap(mat[j][k], mat[j + 1][k]);
                }
            }
        }
    }
}
 
void completionTime(int num, int mat[][6])
{
    int temp, val;
    mat[0][3] = mat[0][1] + mat[0][2];
    mat[0][5] = mat[0][3] - mat[0][1];
    mat[0][4] = mat[0][5] - mat[0][2];
 
    for (int i = 1; i < num; i++) {
        temp = mat[i - 1][3];
        int low = mat[i][2];
        for (int j = i; j < num; j++) {
            if (temp >= mat[j][1] && low >= mat[j][2]) {
                low = mat[j][2];
                val = j;
            }
        }
        mat[val][3] = temp + mat[val][2];
        mat[val][5] = mat[val][3] - mat[val][1];
        mat[val][4] = mat[val][5] - mat[val][2];
        for (int k = 0; k < 6; k++) {
            swap(mat[val][k], mat[i][k]);
        }
    }
}
 
int main()
{
    int num, temp;
 
    cout << "Enter number of Process: ";
    cin >> num;
 
    cout << "...Enter the process ID...\n";
    for (int i = 0; i < num; i++) {
        cout << "...Process " << i + 1 << "...\n";
        cout << "Enter Process Id: ";
        cin >> mat[i][0];
        cout << "Enter Arrival Time: ";
        cin >> mat[i][1];
        cout << "Enter Burst Time: ";
        cin >> mat[i][2];
    }
 
    cout << "Before Arrange...\n";
    cout << "Process ID\tArrival Time\tBurst Time\n";
    for (int i = 0; i < num; i++) {
        cout << mat[i][0] << "\t\t" << mat[i][1] << "\t\t"
             << mat[i][2] << "\n";
    }
 
    arrangeArrival(num, mat);
    completionTime(num, mat);
    cout << "Final Result...\n";
    cout << "Process ID\tArrival Time\tBurst Time\tWaiting "
            "Time\tTurnaround Time\n";
    for (int i = 0; i < num; i++) {
        cout << mat[i][0] << "\t\t" << mat[i][1] << "\t\t"
             << mat[i][2] << "\t\t" << mat[i][4] << "\t\t"
             << mat[i][5] << "\n";
    }
}