Problem 42497. Pancake sorting
Sort a stack of pancakes by flipping them using spatula.
- There are N pancakes with diameters 1:N.
- Spatula can be inserted anywhere in the stack and used to flip all the pancakes above.
- Sort pancakes in increasing order.
- Return a vector of places where spatula was inserted.
- References: math.illinois.edu, wikipedia.
Example (horizontal view):
Initial stack: 6 4 2 5 3 1, ("," indicates position of spatula) first flip: 1 3 5,2 4 6 second: 5 3 1 2 4,6 ... 4 2 1 3,5 6 3 1 2,4 5 6 2 1,3 4 5 6 sorted! 1 2 3 4 5 6
positions of spatula from the begining: 6 3 5 4 3 2
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Problem Comments
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1 Comment
David Verrelli
on 12 Oct 2017
The flipping sequence does not need to be the most efficient, it just needs to (eventually) have the desired effect.
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