Cod sursa(job #936511)
Utilizator | Data | 7 aprilie 2013 14:37:01 | |
---|---|---|---|
Problema | Aria | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.46 kb |
#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>
using namespace std;
ifstream in("aria.in");
ofstream out("aria.out");
int main()
{
int n;
in>>n;
int x1,x2,y1,y2;
in>>x1>>y1;
double carea,totalarea=0;
for(int i=2;i<=n;++i){
in>>x2>>y2;
carea=((abs(y1)+abs(y2))*(x2-x1))/2;
totalarea+=carea;
}
out<<std::fixed<<std::setprecision(5)<<totalarea;
return 0;
}