Cod sursa(job #2430894)
Utilizator | Data | 17 iunie 2019 09:58:31 | |
---|---|---|---|
Problema | Aria | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.42 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream fin("arie.in");
ofstream fout("arie.out");
struct punct
{
double x, y;
} v[100001];
double arie;
int n,i;
int main()
{
fin>>n;
for(i=1; i<=n; ++i)
fin>>v[i].x>>v[i].y;
n++;
v[n].x=v[1].x;
v[n].y=v[1].y;
for(i=1; i<n; ++i)
arie += (v[i].x * v[i+1].y - v[i+1].x * v[i].y);
fout<<arie / 2.0;
return 0;
}