Discussion @ 1828. Approximation by a Progression @ Timus Online Judge

waterlink wa11 [2] // Problem 1828. Approximation by a Progression 19 Mar 2011 17:42

is it a some especial test?

Maxim Dvoynishnikov (Dnipropetrovsk NU) * // Problem 1828. Approximation by a Progression 25 Mar 2011 02:49

I think it's any test with N>1300.

IgorKoval [PskovSU] Re: wa11 // Problem 1828. Approximation by a Progression 8 Oct 2011 01:47

YES!
if you use formula n*(n-1)*(2*n-1)/6 and n is long=> overflow when n > 1300!
use this:
long long n; //!!!

Edited by author 08.10.2011 01:48

Discussion of Problem 1828. Approximation by a Progression