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

void usage (char** argv)
{
      printf ("%s <integer>: output given line of pascal's triangle\n", argv[0]);
}

int main (int argc, char** argv)
{
  if (argc != 2) 
    {
      usage (argv);
      exit (1);
    }

  int line = atoi (argv[1]);

  if (line == 0)
    {
      usage (argv);
      exit (1);
    }
  
  int* from = calloc (line + 1, sizeof(int));
  int* to = calloc (line + 1, sizeof(int));

  *from = 1;

  for (int i = 0; i < line; i++) {
    to[0] = 1;
    for (int j = 1; j < (line + 1); j++) {
      to[j] = from[j - 1] + from [j];
    }
    int* temp = from;
    from = to;
    to = temp;
  }

  for (int i = 0; i < line; i++)
    printf ("%3i", to[i]);
  puts ("\n");
}