Cod sursa(job #2949936)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 2 decembrie 2022 12:23:16
Problema Aria Scor 70
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.25 kb
Raporteaza aceasta sursa 
#include<bits/stdc++.h>
using namespace std;
ifstream F("aria.in");
ofstream G("aria.out");
int n;
double a,b,c,d,x,y,s;
int main()
{
    for(F>>n>>a>>b,x=a,y=b;F>>c>>d;s+=a*d-b*c,a=c,b=d);
	return G<<fixed<<setprecision(6)<<(s+a*y-b*x)/2.0,0;
}