Submission #111730

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
#include <sstream>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define CLR(a) memset((a), 0 ,sizeof(a))
#define REP(i,n) for(int i = 0; i < (int)(n); i++)
#define NUM 0
int main(){
	double xa,ya,xb,yb,xc,yc;
	cin >>xa>>ya>>xb>>yb>>xc>>yc;
	long double temp=(xb-xa)*(yc-ya)-(yb-ya)*(xc-xa);
	if(yb==yc&&xb==xc) temp=0;
	temp=(temp>=0)?temp:-temp;
	cout<<temp/2<<endl;
	return 0;
}

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Judge Result