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

int main() {
    int array[20] = {0};
    int count = 0;

    srand(time(NULL));

    for (int i = 0; i < 20; i++) {
        int num = 1 + rand() % 20;
        int isDuplicate = 0;

        for (int j = 0; j < count; j++) {
            if (array[j] == num) {
                isDuplicate = 1;
                break;
            }
        }

        if (!isDuplicate) {
            array[count] = num;
            count++;
        }
    }

    for (int i = 0; i < count; i++) {
        printf("%d ", array[i]);
    }
    printf("\n");

    return 0;
}