Discussion @ 1289. One Way Ticket @ Timus Online Judge

How to slove it?? tbtbtb 30 Apr 2004 16:50

Re: How to slove it?? Tratata (barssimfi@mail.ru) 27 Jul 2004 21:50

It is very simple problem. Just generate first 5-10 answers. Than U will see how to solve it :-)

Edited by author 27.07.2004 21:51

Re: How to slove it?? Peter Ivanov 27 Aug 2006 04:12

I don't consider this explanation for a reasonable one. If it is so easy - you are to prove it! Otherwise solving it in your way won't help to better understanding the theory behind this concrete problem.

Re: How to slove it?? TIA (Lyceum #165) 7 Feb 2008 23:17

This problem is easy. Just count number of numbers with the same digit root of its half where digit root is equal to 0,1,2,3,4,5,6,7,8,9.
Number where digit root is equal to 0 is 0.
Use /dev/brain to count the other numbers
P.S. digit root(n)=digit root(n+9)

Discussion of Problem 1289. One Way Ticket