Cod sursa(job #2790699)

Utilizator IDKnow1710Cosovanu gabriel IDKnow1710 Data 29 octombrie 2021 13:12:25
Problema Aria Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.26 kb
Raporteaza aceasta sursa 
#include <iostream>

using namespace std;


int main()
{
    int n,i
    long long x,y,x1,y1,s=0;
    cin>>n;
    cin>>x1>>y1;
    for(i=2;i<=n;i++)
    {
   cin>>x>>y;
   s+=x*y1-x1*y;
   x1=x;
   y1=y;

    }
    cout<<s/2;

    return 0;
}