Cod sursa(job #1279565)

Utilizator ionut98Bejenariu Ionut Daniel ionut98 Data 30 noiembrie 2014 16:12:34
Problema Aria Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream f("aria.in");
ofstream g("aria.out");
int n,i,j,x[100005],y[100005],s;
int main ()
{
    f>>n;
    for(i=1;i<=n;i++)
      f>>x[i]>>y[i];
    x[n+1]=x[1];
    y[n+1]=y[1];
    for(i=1;i<=n+1;i++)
      s+=x[i+1]*y[i]-x[i]*y[i+1];
    if(s<0) s*=-1;
    g<<s/2;
    return 0;
}