#include

typedef struct points2D{

    double x;
    double y;
}pts;


double tri_area(pts p1,pts p2,pts p3)
{
    double A;

//Calculating the area of triangles
    A=0.5*((p1.x*p2.y)+(p2.x*p3.y)+(p3.x*p1.y)-(p1.y*p2.x)-(p2.y*p3.x)-(p3.y*p1.x));

    return A;
}

int main()
{
    int N,i,flag=0;
    scanf("%d",&N);
    pts p[N],p1,p2,p3;
    double arr[N];
    for(i=0;i=0)
            {
                flag=1;
                break;
            }
        }
    }
//Set the condition to find out whether all the area of the triangles are +ve
    else
    {
        for(i=1;i