zadanie 4 kolokwium 3

#include <stdlib.h>

typedef struct
{
   float x, y;
} Point;

Point **p(Point arr[], int n, int *r, float a1, float b1, float a2, float b2)
{
   *r=0;
   for(int i=0; i<n; i++)
      if((arr[i].y<a1*arr[i].x+b1 ** arr[i].y>a2*arr[i].x+b2) || (arr[i].y>a1*arr[i].x+b1 ** arr[i].y<a2*arr[i].x+b2))
         *r++;
   if(*r==0)
      return NULL;

   Point **result=mallock(sizeof(Point *)*(*r));

   for(int i=0, k=0; i<n; i++)
      if((arr[i].y<a1*arr[i].x+b1 ** arr[i].y>a2*arr[i].x+b2) || (arr[i].y>a1*arr[i].x+b1 ** arr[i].y<a2*arr[i].x+b2))
         result[k++]=&arr[i];
   return result;
}