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42-push-swap

Write a program in C called push_swap which calculates and displays the smallest program that sorts the integers received as arguments.

You have at your disposal a set of integer values, 2 stacks, and a limited set of instructions to manipulate both stacks. The goal is to sort the data in ascending order on a stack, using the lowest possible number of actions.

Sorting values is simple. To sort them the fastest way possible is less simple. Especially because from one integers configuration to another, the most efficient sorting solution can differ.

Rules

At the beginning:

  • The stack a contains a random amount of negative and/or positive numbers which cannot be duplicated. The first argument should be at the top of the stack a
  • The stack b is empty

The program must display the smallest list of instructions possible to sort the stack a, the smallest number being at the top.

The following operations are allowed:

  • sa (swap a): Swap the first 2 elements at the top of stack a. Do nothing if there is only one or no elements.
  • sb (swap b): Swap the first 2 elements at the top of stack b. Do nothing if there is only one or no elements.
  • ss : sa and sb at the same time.
  • pa (push a): Take the first element at the top of b and put it at the top of a. Do nothing if b is empty.
  • pb (push b): Take the first element at the top of a and put it at the top of b. Do nothing if a is empty.
  • ra (rotate a): Shift up all elements of stack a by 1. The first element becomes the last one.
  • rb (rotate b): Shift up all elements of stack b by 1. The first element becomes the last one.
  • rr : ra and rb at the same time.
  • rra (reverse rotate a): Shift down all elements of stack a by 1. The last element becomes the first one.
  • rrb (reverse rotate b): Shift down all elements of stack b by 1. The last element becomes the first one.
  • rrr : rra and rrb at the same time.

To better understand these operations you can play this game made by Paula Hemsi

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