X's and O's
Logic
Level
2
Let's play a game! Given a string of X's and O's, you can
- Replace any "X" by "XO".
- Replace any "XXX" by "OX".
- Replace any "OO" by "XOO".
What is the fewest number of steps needed to change the string OOX into OXOOOX?
by
Andrew Ellinor