Cod sursa(job #229610)

Utilizator gabipurcaruGabi Purcaru gabipurcaru Data 10 decembrie 2008 20:34:55
Problema Poligon Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.2 kb
Raporteaza aceasta sursa 
#include<fstream.h>
ifstream in("puncte.in");
ofstream out("puncte.out");
unsigned long int n,k,s;
int main()
{
in>>n;
n-=3;
for(k=1; k<=n; k++)
		s+=((n-k+1)*(k+k*(n-k+1)))/2;
out<<s;
return 0;
}