Cod sursa(job #1679092)
Utilizator | Data | 7 aprilie 2016 18:01:16 | |
---|---|---|---|
Problema | Aria | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.45 kb |
#include <fstream>
#include <iomanip>
using namespace std;
ifstream f("aria.in");
ofstream g("aria.out");
int n,i;
double arie;
struct punctul
{
double x,y;
} pct[100003] ;
int main()
{
f>>n;
for(i=1;i<=n;i++)
f>>pct[i].x>>pct[i].y;
pct[n+1]=pct[1];
for(i=1;i<=n;i++)
arie=arie+(pct[i].x*pct[i+1].y-pct[i+1].x*pct[i].y);
if(arie<0) arie*=-1;
g<<fixed<<setprecision(5)<<(arie/2.0);
return 0;
}