The ultimate guide to recursion interviews! Gain a structured approach to recursion basics and solve real-world problems. Get interview-ready in just a few hours with strategies developed by FAANG engineers.

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
Imagine that we have to find the number of **vowels** in a given string. We know that the **English alphabet** contains $5$ vowels:
$a, e, i, o, u$. Let's solve this problem using both iterative and recursive methods.

## Iterative Method
To solve this problem we have to traverse the entire string so that we can initiate a simple `for` loop.


In this lesson, we will learn how to find the number of vowels in a string using recursion.

Recursion Fundamentals

Iteration Vs. Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Count Vowels in a String

Problem Statement

Iterative Method