Submission #111375

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Source Code Expand

#include<algorithm>
#include<string>
#include<iostream>
#include<cstdio>
#define rep(i,n) for(int i = 0; i < n; i++)
using namespace std;

double x[3], y[3];

double mabs(double a){ if(a < 0) return -a; else return a;}

int main(){
	rep(i,3) cin >> x[i] >> y[i];
	
	double dx = x[0]-x[1], dy = y[0]-y[1];
	double ex = x[2]-x[1], ey = y[2]-y[1];
	
	printf("%f\n",mabs(dx*ey-ex*dy)/2);
	
	return 0;
}

Submission Info

Judge Result