delete pics to save space

2.11437.cpp

@@ -0,0 +1,61 @@
+#include<cstdio>
+struct Point
+{
+	double x,y;
+	Point(double x=0,double y=0):x(x),y(y){}
+};
+typedef Point Vector;
+
+inline Point read_point()
+{
+	Point A;
+	scanf("%lf%lf",&A.x,&A.y);
+	return A;
+}
+
+inline Vector operator+(const Vector &A,const Vector &B)
+{ return Vector(A.x+B.x,A.y+B.y); }
+
+inline Vector operator-(const Point &a,const Point &b)
+{ return Vector(a.x-b.x,a.y-b.y); }
+
+inline Vector operator*(const Vector &A,double p)
+{ return Vector(A.x*p,A.y*p); }
+
+inline Vector operator/(const Vector &A,double p)
+{ return Vector(A.x/p,A.y/p); }
+
+inline double Cross(const Vector &A,const Vector &B)
+{ return A.x*B.y-A.y*B.x; }
+
+inline double Area2(const Point &a,const Point &b,const Point &c)
+{ return Cross(b-a,c-a); }
+
+inline Point GetLineIntersection
+(const Point &A1,const Point &B1,const Point &A2,const Point &B2)
+{
+	Vector u=A1-A2,v=B1-A1,w=B2-A2;
+	double t=Cross(w,u)/Cross(v,w);
+	return A1+v*t;
+}
+int n;
+Point A,B,C,D,E,F,P,Q,R;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	while(n-->0)
+	{
+		A=read_point();B=read_point();C=read_point();
+		D=B+(C-B)/3;
+		E=C+(A-C)/3;
+		F=A+(B-A)/3;
+		P=GetLineIntersection(B,E,D,A);
+		Q=GetLineIntersection(B,E,C,F);
+		R=GetLineIntersection(D,A,C,F);
+		printf("%.0lf\n",Area2(P,Q,R)/2);
+	}
+	return 0;
+}