#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;
}

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