Cod sursa(job #3146664)
Utilizator | Valentin Chipuc valentinchipuc123 | Data | 22 august 2023 01:53:34 |
---|---|---|---|
Problema | Aria | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.46 kb |
#include <bits/stdc++.h>
using namespace std;
struct points {
int a, b;
}v[100005];
int main()
{
ifstream f("aria.in");
ofstream g("aria.out");
int n;
cin>>n;
for(int i=0; i<n; i++) {
cin>>v[i].a>>v[i].b;
}
v[n]=v[0];
double area = 0;
for(int i=0; i<n; i++) {
area += v[i].a * v[i+1].b - v[i+1].a * v[i].b;
}
area /= 2;
cout<<fixed<<setprecision(5)<<area;
return 0;
}