Cod sursa(job #2039607)
| Utilizator |  Virtejaru Mihai stahlhelm |
Data | 14 octombrie 2017 18:13:05 |
|---|---|---|---|
| Problema | Aria | Scor | 0 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.32 kb |
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
ifstream f("aria.in");
ofstream c("aria.out");
int main()
{ long x[10^5],y[10^5],N,i,s=0;
f>>N;
for(i=1;i<=N;i++)
f>>x[i]>>y[i];
x[N+1]=x[1];
y[N+1]=y[1];
for(i=1;i<=N;i++)
s=s+x[i]*y[i+1]-x[i+1]*y[i];
c<<setprecision(6)<<s/2;
}
