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typedef struct {
long int p_x, p_y;
} Point;
int
f (Point basePt, Point pt1, Point pt2)
{
long long vector;
vector =
(long long) (pt1.p_x - basePt.p_x) * (long long) (pt2.p_y - basePt.p_y) -
(long long) (pt1.p_y - basePt.p_y) * (long long) (pt2.p_x - basePt.p_x);
if (vector > (long long) 0)
return 0;
else if (vector < (long long) 0)
return 1;
else
return 2;
}
main ()
{
Point b, p1, p2;
int answer;
b.p_x = -23250;
b.p_y = 23250;
p1.p_x = 23250;
p1.p_y = -23250;
p2.p_x = -23250;
p2.p_y = -23250;
answer = f (b, p1, p2);
if (answer != 1)
abort ();
exit (0);
}
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