Brute force algo is just 4^5 actions. So, you can don't think about logical solution :)

He-he, I could not understand how to solve it by bruteforce algo, because my bruteforce doesnt't pass some tests :) Logical algo is very simple.

Edited by author 02.06.2012 15:45

Brute force algo can be done in 2^4 steps and works.

Hmm, my logical algo takes also 16 operations. Four iterations of cycle with four operations  in each iteration.

Edited by author 30.06.2012 21:04