Cod sursa(job #3203193)
Utilizator | Milandru Nicon-David DomnulMilandru | Data | 13 februarie 2024 11:31:02 |
---|---|---|---|
Problema | Aria | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.55 kb |
#include <fstream>
#include <vector>
#include <iomanip>
#include <cstdlib>
using namespace std;
ifstream cin("aria.in");
ofstream cout("aria.out");
int n;
vector<pair<long double,long double> > A;
long double arie;
int main()
{
cout<<setprecision(10)<<fixed;
cin>>n;
A.resize(n+1);
for(int i=0;i<n;i++)
cin>>A[i].first>>A[i].second;
A[n]=A[0];
for(int i=0;i<n;i++)
arie=arie+A[i].first*A[i+1].second-A[i].second*A[i+1].first;
if(arie<0)
arie=arie*-1;
cout<<arie/2;
return 0;
}