Cod sursa(job #2683542)
Utilizator | Ioana Popa ioana0211 | Data | 11 decembrie 2020 16:34:47 |
---|---|---|---|
Problema | Aria | Scor | 10 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.46 kb |
#include <fstream>
#include <iomanip>
using namespace std;
ifstream fin ("aria.in");
ofstream fout ("aria.out");
int n;
double arie=0;
struct punct
{
double x;
double y;
};
punct p[100010];
int main()
{
fin>>n;
for(int i=1; i<=n; i++)
fin>>p[i].x>>p[i].y;
p[n+1]=p[1];
for(int i=1; i<=n; i++)
arie+=(p[i].x*p[i+1].y-p[i+1].x*p[i].y);
//fout<<setprecision(20)<<arie/2;
fout<<arie/2;
return 0;
}