#include "geom.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>


/* **************************************** */
/* returns the signed area of triangle abc. The area is positive if c
   is to the left of ab, and negative if c is to the right of ab
 */
int signed_area2D(point2D a, point2D b, point2D c) {

  return 1; 
}



/* **************************************** */
/* return 1 if p,q,r collinear, and 0 otherwise */
int collinear(point2D p, point2D q, point2D r) {
  
  return 1; 
}



/* **************************************** */
/* return 1 if c is  strictly left of ab; 0 otherwise */
int left (point2D a, point2D b, point2D c) {
  
  return 1; 
}



/* compute the convex hull of the points in p; the points on the CH are returned as a list 
*/
pointNode* graham_scan(point2D* p, int n) {

  

  return NULL; 
}