Question 15
Two robots move on the board with three commands: forward one square, turn left, or turn right.

The orange robot initially faces right and the blue robot faces left. Both receive exactly the same command sequence. They must reach the house without entering a gray obstacle cell.

What is the minimum number of commands in a common instruction sequence?

The orange robot initially faces right and the blue robot faces left. Both receive exactly the same command sequence. They must reach the house without entering a gray obstacle cell.

What is the minimum number of commands in a common instruction sequence?