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Push_swap

This project is about sorting numbers considering two stacks and using only the following instructions:

  • 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 flast element becomes the first one.
  • rrb : reverse rotate b - shift down all elements of stack b by 1. The flast element becomes the first one.
  • rrr : rra and rrb at the same time

Getting Started

Usage

To generate the set of instructions for a set of numbers:

./push_swap n1 n2 n3...

and to check wether the set of instructions really sorts:

./push_swap n1 n2 n3... | ./checker [-v] n1 n2 n3 ...

Example

ARG=`ruby -e "puts (-50..50).to_a.shuffle.join(' ')"` ; ./push_swap $ARG | ./checker -v $ARG

Visualizer

The visualizer have several commands:

  • Right arrow: do one step
  • 0 (numpad): pause autoplay
  • 1-9 (numpad): autoplay (1 is slowest, 9 is fastest)
  • space: BOOSTER (play as fast as possible)

Prerequisites

You will need SDL2

Debian

sudo apt-get install sdl2

OSX

brew install sdl2

Compiling

make all

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