Cod sursa(job #3219260)
Utilizator | Feraru Rares-Serban PsyDuck1914 | Data | 30 martie 2024 16:23:55 |
---|---|---|---|
Problema | Aria | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.54 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream f ("aria.in");
ofstream g ("aria.out");
const int NMAX = 1e5;
struct ura{
long double x, y;
}v[NMAX+5];
int main()
{
int n;
f >> n;
for(int i=1; i<=n; i++)
f >> v[i].x >> v[i].y;
v[n+1].x = v[1].x;
v[n+1].y = v[1].y;
long double sum = 0;
for(int i=1; i<=n; i++)
sum += (v[i].x * v[i+1].y - v[i+1].x * v[i].y);
sum /= 2.0;
g << fixed << setprecision(5) << abs(sum);
return 0;
}