The ultimate guide to bit manipulation for coding interviews. Developed by FAANG engineers, practice with real-world interview questions, and get interview-ready in just a few hours.

This course teaches bit manipulation, a powerful technique to enhance algorithmic and problem-solving skills. It is a critical topic for those preparing for coding interviews for top tech companies, startups and industry leaders. Competitive programmers can take full advantage of this course by running most of the bit-related problems in O(1) complexity.

The course will begin by educating you about the number system and its representation, decimal and binary, followed by the six bitwise operators: AND, OR, NOT, XOR, and bit-shifting (left, right).

You will receive ample practical experience working through practice problems to improve your comprehension.

Upon completing this course, you will be able to solve problems with greater efficiency and speed.

Grokking Bit Manipulation for Coding Interviews

# Introduction

Let’s do another challenging question to check your understanding of Bitwise operators.


For example:

```
Input: 4
 
Output: True (As 4 is 2^2)
```

```
Input: 12
 
Output: False
```

# Problem statement
Write a program to check if a given number is a power of 2 or not.

Let's consider a number and find how the AND operator does this.

```
Input = 64
 
Output: True
```

Explanation: We solve by making use of the `&` operator in computers. There are many ways to solve this, of which two approaches are simple, and one of them is a more complex but better solution.

> Assume n is non-negative. Use the & operator to achieve this.

In this lesson, we will try to check if the given number is a power of 2. We solve this by writing an efficient algorithm that takes an optimal amount of time.

Getting Started

Number Systems, Bitwise, and Binary

Bitwise AND

Bitwise OR

Bitwise NOT

Bitwise XOR

Bit Shifting - Left, Right

Bitwise LeftShift Problems

Bitwise RightShift Problems

Final Thoughts

Challenge 3: Power of 2

Introduction

Problem statement