# Challenge 1: Single Number

In this lesson, every element appears twice except one element. We solve this using naive, and then we move to solve it more optimally using XOR operator.

This article discusses array data structure with sketches, memory diagrams, array capacity vs. length, strengths & weaknesses, big-O complexities, and more!

Overview In this course, you will learn how to solve problems using bit manipulation, a powerful technique that can be used to optimize your algorithmic and problem-solving skills. This is one of the most important/critical topics when someone starts preparing for coding interviews for FAANG companies. To kick things

This problem tests your knowledge of mathematics. Solving this problem helps you find the place values and how they are represented in the decimal number system.