trik

Trik

ID: trik

Difficulty: 1.4

CPU Time: 1 second

Memory: 1024 MB

Solution

For this one, one can start the ball at 1, and for each move it reads in from the string (A, B, or C), if the ball actually is at one of the two positions involved, swap them. The precondition is necessary to prevent moving the ball around for a move where the ball is not actually in one of the cups.