Cod sursa(job #3225885)
Utilizator | Dobre Darius Adrian Darius1414 | Data | 19 aprilie 2024 11:46:57 |
---|---|---|---|
Problema | Aria | Scor | 70 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.43 kb |
#include <iostream>
#include <fstream>
#include <iomanip>
#define nmx 100005
using namespace std;
int n;
double x[nmx],y[nmx],rsp;
int main()
{
ifstream f ("aria.in");
ofstream g ("aria.out");
f>>n;
for (int i=1;i<=n;i++)
f>>x[i]>>y[i];
x[n+1]=x[1];
y[n+1]=y[1];
g<<fixed<<setprecision(5);
for (int i=1;i<=n;i++)
rsp+=x[i]*y[i+1]-x[i+1]*y[i];
rsp/=2;
g<<rsp;
}