Cod sursa(job #2874935)
Utilizator | Matei Panzariu Matei_Panzariu | Data | 20 martie 2022 15:29:12 |
---|---|---|---|
Problema | Aria | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.44 kb |
#include<fstream>
#include<iomanip>
#include<cmath>
using namespace std;
ifstream cin("aria.in");
ofstream cout("aria.out");
struct puncte
{
long double x,y;
};
puncte v[100005];
int n;
long double arie;
int main()
{
cin>>n;
for(int i=1;i<=n;i++)
cin>>v[i].x>>v[i].y;
v[n+1]=v[1];
for(int i=1;i<=n;i++)
arie+=(v[i].x*v[i+1].y-v[i+1].x*v[i].y);
cout<<setprecision(6)<<fixed<<fabs(arie/2.0);
}