Cod sursa(job #1679073)
Utilizator | FMI Savoiu Valentin-Marian ValentinSavoiu | Data | 7 aprilie 2016 17:50:16 |
---|---|---|---|
Problema | Aria | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.44 kb |
#include <fstream>
using namespace std;
ifstream f("aria.in");
ofstream g("aria.out");
int n,i;
double arie,puncte[2][100003];
int main()
{
f>>n;
for(i=0;i<n;i++)
f>>puncte[0][i]>>puncte[1][i];
puncte[0][n]=puncte[0][0];
puncte[1][n]=puncte[1][0];
for(i=0;i<n;i++)
arie=arie+(puncte[0][i]*puncte[1][i+1]-puncte[0][i+1]*puncte[1][i]);
if(arie<0) arie*=-1;
g<<arie/2.0;
return 0;
}