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OGordoo
5 years ago
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## push-swap |
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### Objectives |
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Push_swap is a very simple and highly effective algorithm.You have at your disposal a list of `int` values, two stacks (`a` and `b`) and a set of instructions. |
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You will have two write 2 programs: |
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- **push_swap**, which calculates and displays on the standard output the smallest program using push_swap instruction language that sorts integer arguments received. |
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- **checker**, which takes integer arguments and reads instructions on the standard output. Once read, checker executes them and displays `OK` if integers are sorted. Otherwise, it will display `KO`. |
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As said before, you will have two stacks at your disposal. Your goal is to sort stack `a`, that will contain the `int` values received, in ascending order, using both stacks and a set of instructions. |
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These are the instructions that you can use to sort the stack : |
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- `pa` push the top first element of stack `b` to stack `a` |
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- `pb` push the top first element of stack `a` to stack `b` |
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- `sa` swap first 2 elements of stack `a` |
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- `sb` swap first 2 elements of stack `b` |
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- `ss` execute `sa` and `sb` |
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- `ra` rotate stack `a` (shift up all elements of stack `a` by 1, the first element becomes the last one) |
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- `rb` rotate stack `b` |
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- `rr`execute `ra` and `rb` |
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- `rra` reverse rotate `a` (shift down all elements of stack `a` by 1, the first element becomes the last one) |
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- `rrb` reverse rotate `b` |
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- `rrr` execute `rra` and `rrb` |
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#### Example |
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```console |
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--------------------------------------- |
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Init a and b : |
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2 |
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1 |
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3 |
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6 |
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8 |
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5 |
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= = |
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a b |
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--------------------------------------- |
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Exec sa : |
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1 |
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2 |
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3 |
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6 |
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8 |
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5 |
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= = |
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a b |
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--------------------------------------- |
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Exec pb pb pb : |
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6 3 |
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8 2 |
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5 1 |
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= = |
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a b |
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--------------------------------------- |
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Exec ra rb (equivalent to rr): |
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8 2 |
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5 1 |
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6 3 |
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= = |
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a b |
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--------------------------------------- |
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Exec rra and rrb (equivalent to rrr): |
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6 3 |
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8 2 |
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5 1 |
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= = |
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a b |
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--------------------------------------- |
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Exec sa: |
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8 3 |
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6 2 |
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5 1 |
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= = |
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a b |
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--------------------------------------- |
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Exec pa pa pa: |
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1 |
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2 |
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3 |
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5 |
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6 |
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8 |
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= = |
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a b |
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--------------------------------------- |
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``` |
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This project will help you learn about : |
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- the use of basic algorithms |
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- the use of sorting algorithms |
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- the use of stacks |
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#### The push_swap program |
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- You have to write a program named push_swap, which will receive as an argument the stack a formatted as a list of integers. The first integer should be at the top of the stack. |
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- The program must display the smallest list of instructions possible to sort the stack `a`, with the smallest number being at the top. |
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- Instructions must be separated by a `\n` and nothing else. |
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- The goal is to sort the stack with the minimum possible number of operations. |
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- In case of error, you must display `Error` followed by a `\n` on the standard error. Errors include for example: some arguments aren’t integers and/or there are duplicates. |
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```console |
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$>./push_swap 2 1 3 6 5 8 |
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sa |
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pb |
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pb |
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pb |
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sa |
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pa |
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pa |
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pa |
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$>./push_swap 0 one 2 3 |
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Error |
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$> |
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``` |
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#### The checker program |
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- You have to write a program named checker, which will get as an argument the stack a formatted as a list of integers. The first argument should be at the top of the stack (be careful about the order). If no argument is given checker stops and displays nothing. |
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- Checker will then read instructions on the standard input, each instruction will be followed by `\n`. Once all the instructions have been read, checker will execute them on the stack received as an argument. |
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- If after executing those instructions, stack `a` is actually sorted and `b` is empty, then checker must display "OK" followed by a `\n` on the standard output. In every other case, checker must display "KO" followed by a `\n` on the standard output. |
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- In case of error, you must display Error followed by a `\n` on the standard error. Errors include for example: some arguments are not integers, there are duplicates, an instruction don’t exist and/or is incorrectly formatted. |
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```console |
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$>./checker 3 2 1 0 |
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rra |
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pb |
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sa |
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rra |
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pa |
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OK |
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$>./checker 3 2 1 0 |
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sa |
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rra |
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pb |
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KO |
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$>./checker 3 2 one 0 |
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Error |
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$> |
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``` |
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### Instructions |
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- Your project must be written in **Go**. |
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- The code must respect the [**good practices**](https://github.com/01-edu/public/good-practices.en.md). |
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- It is recommended that the code should present a **test file**. |
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- The first executable file must be named **checker** and the second **push_swap**. |
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- You have to be able to handle the errors. |
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