The ultimate recursion guide! Master basics, solve real-world problems, and get interview-ready in hours with FAANG engineers’ proven strategies.

If you’ve ever struggled with solving coding problems using recursion, or if you need to brush up your recursion skills for an interview, this course is for you! We will start with the basics of recursion before we practice solving actual coding problems. You’ll have access to detailed explanations and visualizations for each problem to help you along the way.

By the time you have completed this course, you’ll be able to use all the concepts of recursion to solve complex, real-world problems. We hope that this course will help you ace all the recursion related questions during interviews at top tech companies!

Recursion for Coding Interviews in Python

## Problem Statement
Implement a function that takes a stack, `testVariable`, and reverses it. Do not use any other extra stack or data structure.

> Helper functions are provided in the file `stack.py`. Take a look at the file before implementing your solution.

### Input
A variable `testVariable` that contains a stack.

### Output
No **explicit output**. Our task is to reverse the contents of the stack.

### Sample Input
```
8, 5, 3, 2
```




# Problem Statement
Implement a function that takes a stack, `testVariable`, and reverses it. Do not use any other extra stack or data structure.

> Helper functions are provided in the file `stack.py`. Take a look at the file before implementing your solution.

## Input
A variable `testVariable` that contains a stack.

## Output
No **explicit output**. Our task is to reverse the contents of the stack.

## Sample Input
```
8, 5, 3, 2
```




Given a stack, reverse the contents of the stack.

Recursion Fundamentals

Iteration Vs. Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Challenge 2: Reverse a Stack

Problem Statement

Input

Output

Sample Input