#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <math.h>

#define SIZE 1000
int search(const unsigned char *t, int start, int end)
{
    pid_t p;
    int i, status, moitie = ceil((start + end) / 2);
    p = fork();
    switch (p)
    {
    case -1:
        exit(1);
    case 0:
        for (i = 0; i < moitie; i++)
        {
            if (t[i] == 0)
                exit(1);
        }
        exit(0);
    default:
        for (i = moitie; i <= end; i++)
        {
            if (t[i] == 0)
                return 1;
        }
        wait(&status);
        return WEXITSTATUS(status);
    }
}

int main(int argc, char *argv[])
{
    int i;
    unsigned char arr[SIZE];

    srandom(time(NULL));

    for (i = 0; i < SIZE; i++)
        arr[i] = (unsigned char)(random() % 255) + 1;

    printf("Enter a number between 0 and %d: ", SIZE);
    scanf(" %d", &i);
    if (i >= 0 && i < SIZE)
        arr[i] = 0;

    if (search(arr, 0, SIZE - 1))
        printf("Found !\n");
    else
        printf("Not found !\n");
    return EXIT_SUCCES;
}