Решите безотлагательно!35 баллов!Задачка на фото,желанно с++,но можно и на ином языке.

include lt;iostreamgt;
include lt;cmathgt;
using namespace std;
double s(double x, double y, double z)

double p = (x + y + z) / 2;
return sqrt(p*(p - x)*(p - y)*(p - z));

double l(double x, double y, double x1, double y1)

return sqrt((x - x1)*(x - x1) + (y - y1)*(y - y1));

int main()

double x, y, x1, y1, x2, y2, x3, y3,n,ans=0;
cin gt;gt; x gt;gt; y gt;gt; x1 gt;gt; y1 gt;gt; x2 gt;gt; y2gt;gt;n;
double len1 = l(x, y, x1, y1); //ab
double len2 = l(x1, y1, x2, y2); //bc
double len3 = l(x, y, x2, y2); // ac
double s1 = s(len1, len2, len3);//s(ab,bc,ac)
 for(int i=0;ilt;n;i++)

cin gt;gt; x3 gt;gt; y3;
double len4 = l(x, y, x3, y3); //at 
double len5 = l(x1, y1, x3, y3);//bt 
double len6 = l(x2, y2, x3, y3);//ct
double s2 = s(len1, len4, len5);//s(ab,bc,)
double s3 = s(len3, len4, len6);
double s4 = s(len6, len5, len2);
 if (абс(s1 - (s2 + s3 + s4)) lt; 0.000001)
ans++;

cout lt;lt; ans;
 return 0;