There are six buttons in a row. Each button shows an arrow pointing left (L) or right (R). When you press a button, all buttons in the direction of its arrow (not including itself) rotate 180 degrees.

Find the least number of button presses required to get from RRRLLL to LRLRLR.

(In reply to Question / Clarification by Larry)

You assume correctly.

Posted by Tristan on 2006-10-13 13:54:27