Submission #111490

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Source Code Expand

#include <iostream>
#include <math.h>

using namespace std;

int main(void)
{
	long xa,ya,xb,yb,xc,yc;
	
	cin >> xa >> ya >> xb >> yb >> xc >> yc;
	
//	double a = sqrt((xa-xb)*(xa-xb)+(ya-yb)*(ya-yb));
//	double b = sqrt((xb-xc)*(xb-xc)+(yb-yc)*(yb-yc));
//	double c = sqrt((xc-xa)*(xc-xa)+(yc-ya)*(yc-ya));
//	double s = (a+b+c)/2;
	
//	cout << sqrt(fabs(s*(s-a)*(s-b)*(s-c))) << endl;
	
	double x1 = xa - xc;
	double y1 = ya - yc;
	double x2 = xb - xc;
	double y2 = yb - yc;
	
	cout << fabs(0.5*(x1*y2-x2*y1)) << endl;	
	
	return(0);
}

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