#include <stdio.h>
extern void sort(unsigned long * arr, unsigned long len);
int main(int argc, char * argv[]) {
long n = 12;
unsigned long arr[] = {1, 4, 7, 4, 3, 8, 4, 8, 1, 3, 7, 3};
sort(arr, n) ;
for(int i = 0; i < n ; ++i) {
printf("%lu ", arr[i]);
}
printf("\n") ;
}