Shortest_Job_First CPU scheduling

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#include <stdio.h>
#include <conio.h>
struct proc
{
    int id;
    int burst;
    int at;
};
int main()
{
    int n, i, j, total_waiting_time, waiting_time;
    printf("Enter the number of processess: ");
    scanf("%d", &n);
    struct proc p[n], temp;
    for (i = 0; i < n; i++)
    {
        p[i].id = i;
        printf("Enter the arrival time of the process: ");
        scanf("%d", &p[i].at);
        printf("Enter the burst time of the process: ");
        scanf("%d", &p[i].burst);
    }
    for (i = 0; i < n - 1; i++)
    {
        for (j = i; j < n - 1 + 1; j++)
        {
            if (p[j].at < p[i].at)
            {
                temp.id = p[j].id;
                temp.at = p[j].at;
                temp.burst = p[j].burst;

                p[j].id = p[i].id;
                p[j].burst = p[i].burst;
                p[j].at = p[i].at;

                p[i].id = temp.id;
                p[i].burst = temp.burst;
                p[i].at = temp.at;
            }
        }
    }
    for (i = 0; i < n - 1; i++)
    {
        for (j = 0; j < n - i - 1; j++)
        {
            if (p[j].at == p[j + 1].at && p[j].burst > p[j + 1].burst)
            {
                temp.at = p[j].at;
                temp.burst = p[j].burst;
                temp.id = p[j].id;

                p[j].id = p[j + 1].id;
                p[j].burst = p[j + 1].burst;
                p[j].at = p[j + 1].at;

                p[j + 1].id = temp.id;
                p[j + 1].at = temp.at;
                p[j + 1].burst = temp.burst;
            }
        }
    }
    waiting_time = 0, total_waiting_time = 0;
    printf("\nScheduling information \n");
    for (i = 0; i < n; i++)
    {
        total_waiting_time += waiting_time;
printf("process id:%d arrival time:%d burst time:%d waiting time:%d\n", 
p[i].id, p[i].at, p[i].burst, waiting_time);
        waiting_time += p[i].burst;
    }
    printf("\nThe average waiting time: %1.2f: ", 
    ((float)total_waiting_time / n));
}

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