Cod sursa(job #2437264)

Utilizator RazvanucuPopan Razvan Calin Razvanucu Data 9 iulie 2019 08:09:55
Problema Aria Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>
using namespace std;
ifstream f("aria.in");
ofstream g("aria.out");
struct pct{
double x,y;
}v[100001];
int n,i;
double A;
int main()
{
    f>>n;

    for(i=0;i<n;i++)
        f>>v[i].x>>v[i].y;

        v[n]=v[0];

    for(i=0;i<n;i++)
        A+=(v[i].x*v[i+1].y-v[i+1].x*v[i].y);

    g<<A/2;
    return 0;
}