Cod sursa(job #2526803)
Utilizator | Iustinian Serban LeCapata | Data | 19 ianuarie 2020 11:22:37 |
---|---|---|---|
Problema | Aria | Scor | 10 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.6 kb |
#include <fstream>
#include <iomanip>
#include <cmath>
using namespace std;
ifstream in("aria.in");
ofstream out("aria.out");
struct coordonate{
double x;
double y;
};
int n;
double suma;
double arie;
coordonate coord[100005];
int main()
{
in>>n;
for(int i=1; i<=n; i++)
in>>coord[i].x>>coord[i].y;
coord[n+1].x=coord[1].x;
coord[n+1].y=coord[1].y;
for(int i=1; i<=n; i++)
suma+=(coord[i].x*coord[i+1].y)-(coord[i+1].x*coord[i].y);
arie=suma/2.0;
out<<fabs(arie);
in.close();
out.close();
return 0;
}