wewnatrz trojkata

#include <iostream>
#include <stdio.h>
using namespace std;
typedef struct { double x; double y; } Point;
bool isPointInsideTriangle(const Point triangle[3], const Point &b)
{
    int notPlus(0), notMinus(0);
    for (int i=0; i<=3; i++) {
        const Point &a= triangle[i%3];
        const Point &c= triangle[i-1];
        double x = (c.x-a.x)*(b.y-a.y)-(c.y-a.y)*(b.x-a.x);
        if (x<=0) notPlus++;
        if (x>=0) notMinus++;
    }
    return (notPlus==3) || (notMinus==3);
}
int main()
{
        double xa, ya, xb, yb, xc, yc;
        cin >> xa >> ya >> xb >> yb >> xc >> yc;

        Point a;
        a.x = xa; a.y = ya;
        Point b;
        b.x = xb; b.y = yb;
        Point c;
        c.x = xc; c.y = yc;
        Point triangle[3] = {a, b, c};

        int n;
        cin >> n;
        for (int i = 0; i < n; i++)
        {
        double xa2, ya2, xb2, yb2, xc2, yc2;
            cin >> xa2 >> ya2 >> xb2 >> yb2 >> xc2 >> yc2;
            Point aa;
            aa.x = xa2; aa.y = ya2;
            Point bb;
            bb.x = xb2; bb.y = yb2;
            Point cc;
            cc.x = xc2; cc.y = yc2;
            if (isPointInsideTriangle(triangle, aa)==true && isPointInsideTriangle(triangle, bb)==true && isPointInsideTriangle(triangle, cc)==true)
            {
                cout << "tak\n";
            }
            else
            {
                cout << "nie\n";
            }
        }
}