Could anybody explain why this code just trying to get
input data fo 1005 works more than  5 seconds

#include<stdio.h>
void main()
{
  long a[21],i;
  printf("\n");
  scanf("%ld",&i);
  a[i]=0;
  while(i--)scanf("%li",&a[i]);
}

Does it mean that input may ends not with \n