Cod sursa(job #2480634)
Utilizator | Gherghinescu Mihai Andrei XXMihaiXX969 | Data | 25 octombrie 2019 21:13:32 |
---|---|---|---|
Problema | Aria | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.5 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream in("aria.in");
ofstream out("aria.out");
const int DIM =1e5 + 7;
struct punct
{
double x,y;
}v[DIM];
int main()
{
int n;
in >> n;
for(int i = 0;i < n; i++)
in >> v[i].x >> v[i].y;
double rez = 0.000000;
v[n] = v[0];
for(int i = 0; i < n; i++)
rez += ((v[i].x * v[i+1].y) - (v[i+1].x * v[i].y));
out <<fixed<<setprecision(6)<< fabs(rez / 2.000000);
return 0;
}