Moving Balls

Computer Science Level 1

You want to transform the configuration on the left to that on the right.

In each step, you can pick a ball on the top of a tube and place it on the top of another tube.

What is the minimum number of steps required?

6 7 8 9

Christopher Boo by Christopher Boo , 24, Singapore

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1 solution

Mike Ali
Nov 19, 2017

1.Green goes to middle, 2.yellow goes to middle on top of green, 3.purple goes to middle on top of yellow

then 4.red goes to right, 5.followed by purple, 6.then yellow and 7.then green

Therefore, 7 steps are required at minimum

5 Helpful 0 Interesting 0 Brilliant 0 Confused

As I see it, 0. On my screen, before and after are the same images.

Bruce Fulton - 3 years, 6 months ago

Wtf? I put 7. It shows"7 is the correct answer"

And says "Incorrect".

Pedro H. F. Waksman - 3 years, 6 months ago

." .... you can pick a ball on the top of a tube and place it on the top of another tube..." ------ a rather confusing statement.

Tanwir Khan - 3 years, 6 months ago

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