# Cracking the coding interview exercises and notes

## Introduction

1. Big O
2. Technical questions

## Chapter 1 Arrays and strings

* check unique characters
* check if permutation
* replace character by substring
* Levenshtein distance
* String compression
* Matrix rotation
* String rotation
* Hash tables (chapter 7)
* Magic index (chapter 8)
* Search in sorted matrix (chapter 10)

## Chapter 7 Object-oriented design

* Hash tables

## Chapter 8 Recursion

* Magic index

## Chapter 10 Sorting and searching

* Sorted matrix search