Cod sursa(job #2333980)
Utilizator | Data | 2 februarie 2019 10:08:06 | |
---|---|---|---|
Problema | Aria | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.46 kb |
#include <iostream>
#include <fstream>
#include <vector>
#include <iomanip>
using namespace std;
ifstream f1("aria.in");
ofstream f2("aria.out");
long double n,x1,y1,x2,y2,a,x,y;
int main() {
f1>>n;
f1>>x1>>y1;
x=x1;
y=y1;
for(int i=0;i<n-1;i++){
f1>>x2>>y2;
a += (y1+y2)*(x2-x1);
x1=x2;
y1=y2;
}
a += (y+y1)*(x-x1);
if(a < 0)
a = 0 -a;
f2<<std::fixed<<std::setprecision(5)<<a;
return 0;
}