Cod sursa(job #2045970)

Utilizator Eduard24Eduard Scaueru Eduard24 Data 23 octombrie 2017 10:28:10
Problema Aria Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("aria.in");
ofstream fout("aria.out");

int n,x1,y1,x2,y2,i,a;

int main()
{
    fin>>n;
    a=0;
    for(i=1;i<=n;i++)
    {
        fin>>x1>>y1;
        fin>>x2>>y2;
        a=a+(x1*y2-x2*y1);
    }
    fout<<a/2;
    return 0;
}