Push_swap

Because Swap_push isn’t as natural

About

• Push_swap is a sorting algorithm project at school 42.
• We start with two stacks called A and B.
• A is filled with some random integers (without duplicates) and B is empty.
• We can perform a limited set of instructions on these stacks and the goal is to sort all these integers using the lowest possible number of actions.
• The limited set of instructions are:

Operation	Description
sa	swap A - swap the first 2 elements at the top of stack A
sb	swap B - swap the first 2 elements at the top of stack B
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
pb	push B - take the first element at the top of a and put it at the top of B
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

Links

• LeoFu9487 Tester (thank you for this awesome tester!)

• Push_swap Visualizer (you will need python3 + rust)

• Radix Sort (I used this algorithm in my project)

Functions

Only the following functions are allowed to be used in this project:

• write
• read
• malloc
• free
• exit
• My own Libft library

Usage

# Clone this project
$ git clone https://github.com/DeRuina/push_swap.git

# Access
$ cd push_swap

# Compile the program
$ make

# Run the project
$ ./push_swap 5 8 7 2

Testing

LeoFu9487 tester: To see if you pass the parsing test (ERROR_TEST), identity test, and small stack test (size 3 and 5), run

bash basic_test.sh

If you want to see the test cases, check trace_basic

After that, you can do medium and big stack test with this command

bash loop.sh <stack size> <loop times>

For example, this is the result of the following command

bash loop.sh 100 10

Author

• @DeRuina