Cod sursa(job #2296607)
Utilizator | Temes George Semetg | Data | 4 decembrie 2018 20:39:31 |
---|---|---|---|
Problema | Aria | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.42 kb |
#include <fstream>
#define N_MAX 100005
using namespace std;
ifstream in { "aria.in" };
ofstream out { "aria.out" };
struct {
double x, y;
} a[N_MAX];
int main() {
int n; in >> n;
for (int i { 1 }; i <= n; ++i)
in >> a[i].x >> a[i].y;
a[n + 1] = a[1];
double A { 0 };
for (int i { 1 }; i <= n; ++i)
A += a[i].x * a[i + 1].y - a[i + 1].x * a[i].y;
out << fabs(A / 2);
}