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

# What does "Replace all Negative Numbers with 0" Mean?

An array can contain **negative numbers**. Our task is to replace all instances of negative numbers with $0$ starting from a given index of the array.


> This process does not create a new array. Rather, we are modifying the same array.

In this lesson, we will learn how to recursively replace all negative numbers with 0 in an array.

Recursion Fundamentals

Iteration Vs. Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Replace All Negative Numbers with Zero

What does “Replace all Negative Numbers with 0” Mean?