#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

void getFlag();
int compare_ascending(const void *a, const void *b);
int compare_descending(const void *a, const void *b);

int main(int argc, char **argv)
{
    char buffer[32];
    int n;
    struct
    {
        int numbers[16];
        volatile int (*comparator)(const void *, const void *);
    } sort_data;

    sort_data.comparator = compare_ascending;

    setbuf(stdout, NULL); // turn off output buffering
    printf("Welcome to *Acme, Inc.*'s number sorting service. Please enter some numbers, end with an empty line:\n");

    n = 0;
    while (fgets(buffer, 128, stdin) != NULL)
    {
        if (buffer[0] == 'A')
            sort_data.comparator = compare_ascending;
        else if (buffer[0] == 'D')
            sort_data.comparator = compare_descending;
        else if (isdigit(buffer[0]))
            sort_data.numbers[n++] = atoi(buffer);
        else
            break;
    }
    printf("Sorting %d numbers...\n", n);
    qsort(sort_data.numbers, n, sizeof(int), sort_data.comparator);

    printf("Here are your sorted numbers:\n");
    for (int i = 0; i < n; i++)
        printf("%d\n", sort_data.numbers[i]);

    return 0;
}

void getFlag()
{
    if(getenv("TASK_NAME")) {
        system("python ctf.py success");
        exit(0);
    } else {
        printf("Success!");
        exit(0);
    }
}

int compare_ascending(const void *a, const void *b)
{
    return *((int *)a) - *((int *)b);
}
int compare_descending(const void *a, const void *b)
{
    return *((int *)b) - *((int *)a);
}