/*
 * Será que pode funcionar?
 */

#include <stdlib.h>

int main() {
  int *s1, *s2, *s3;
  int i;

  s1 = (int *) malloc (sizeof(int) * 20);
  s2 = (int *) malloc (sizeof(int)*  10);

  for (i = 0; i < 20; i++)
    s1[i] = 0;
  
  free(s1);
  free(s2);

  /*    *(s1-1) = 53;
  s3 = (int *) malloc (sizeof(int)*  11);
  for (i = 0; i < 11; i++)
  s3[i] = 2; */

  return 0;                 

}