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