Discussion @ 1502. Domino Dots @ Timus Online Judge

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Discussion of Problem 1502. Domino Dots

Help to understand!!

Posted by Desire 2 Nov 2013 03:05

I know i am stupid but help me to understand this formula!
n*(n+1)/2*(n+2)

Edited by author 02.11.2013 03:06

Edited by author 02.11.2013 03:12

Re: Help to understand!!

Posted by mberdyshev 27 Nov 2015 01:20

This formula is equivalent to the this sum: sum(i=0 -> N) sum(j=i -> N) (i + j)

Edited by author 27.11.2015 01:21