11 Essential Coding Interview Questions + Coding Exercises!

Name: 11 Essential Coding Interview Questions + Coding Exercises!
Rating: 4.7 (4498 reviews)

Learn 3 handy problem solving techniques. Get 11 hand-picked problems. Get ready for your next coding interview!

Created byYK Sugi

Last updated 8/2019

English

What you'll learn

Learn what a coding interview is like
Learn 3 problem solving techniques you'll be able to use in your next coding interview!
Go through 11 of the most essential coding interview questions, coding exercises and answers!
Overall, feel more confident and be ready for your next coding interview

This course includes our updated coding exercises so you can practice your skills as you learn.

6 sections • 35 lectures • 2h 6m total length

Introduction1:23
What Is a Typical Coding Interview Like?2:26
Explore what a typical coding interview looks like, from whiteboard problems to phone interviews. Learn to clarify requirements, choose a suitable language, and apply time-efficient problem-solving techniques.
Problem Solving Technique #1 for Coding Interviews5:27
Think on paper to frame problems conceptually before coding, then translate solutions into data structures like a hash table to find pairs that multiply to 20.
Problem Solving Technique #2 for Coding Interviews3:06
Problem Solving Technique #3 for Coding Interviews2:17
Master communicating your thinking in coding interviews, thinking conceptually first, and asking clarifying questions, as you tackle essential topics like arrays, strings, 2d arrays, linked lists, and trees.

Most Frequently Occurring Item in an Array (Difficulty = *)1:06
Most Frequently Occurring Item in an Array (Python)
Most Frequently Occurring Item in an Array (Java)
Most Frequently Occurring Item in an Array (Solution)3:39
Track the most frequent item in an array using a dictionary to count occurrences, update the max item, and return the result.
Common Elements in Two Sorted Arrays (Difficulty = **)0:53
Find the intersection of two sorted arrays in ascending order and return their common elements, such as 1, 4, and 9, using an efficient O(max(n, m)) approach.
Common Elements in Two Sorted Arrays (Python)
Common Elements in Two Sorted Arrays (Java)
Common Elements in Two Sorted Arrays (Solution)3:37
Is One Array a Rotation of Another? (Difficulty = **)1:06
Is One Array a Rotation of Another? (Python)
Is One Array a Rotation of Another? (Java)
Is One Array a Rotation of Another? (Solution)4:10

Non-Repeating Character (Difficulty = **)0:47
Non-Repeating Character (Python)
Non-Repeating Character (Java)
Non-Repeating Character (Solution)2:48
Learn a linear time solution to the non-repeating character problem by counting characters with a hash map and returning the first with count one, or null if none.
One Away Strings (Difficulty = ***)2:17
One Away Strings (Python)
One Away Strings (Java)
One Away Strings (Solution)3:05
One Away Strings (Solution in Pseudocode)5:31

N-th Element of a Linked List (Difficulty = **)2:29
N-th Element of a Linked List (Python)
N-th Element of a Linked List (Java)
N-th Element of a Linked List (Solution)5:07
Use a two-pointer approach to find the nth node from the end of a linked list, with left and right pointers and null-head edge-case checks.
Is This a Binary Search Tree? (Difficulty = **)3:08
Is This a Binary Search Tree? (Python)
Is This a Binary Search Tree? (Java)
Is This a Binary Search Tree? (Solution)2:43
Is This a Binary Search Tree? (Solution in Pseudocode)5:05
Lowest Common Ancestor (Difficulty = ***)3:24
Lowest Common Ancestor (Python)
Lowest Common Ancestor (Java)
Lowest Common Ancestor (Solution)7:01
Lowest Common Ancestor (Solution in Pseudocode)7:41

You should be familiar with at least one C-like programming language (could be Java, Python, C++, Ruby, JavaScript, etc.)
You should be familiar with basic data structures such as arrays, hash tables, linked lists, trees, and graphs
You should be familiar with the Big O notation

As you prepare for your next coding interview, have you ever thought:

"I wish someone could just walk me through these problems and explain what’s going on."
"I wish there was a preselected set of the most important coding interview problems so I can practice them easily."

If so, this course is for you!

In this course:

First, I’m going to give you a few problem solving techniques you’ll be able to use right away in your next coding interview.
Then, I’m going to walk you through the 11 essential coding interview questions and their answers.
I’ve picked these particular questions because they are the types of questions that are asked most often in programming interviews.
I’m going to cover problems that use concepts such as arrays, strings, two-dimensional arrays, linked lists and trees.
You’ll get a coding exercise in Python and Java for each problem, so you can get feedback on your solution right away.
If you want to use any other language to follow this course, that’s fine too! Just remember to run your solution on your computer to make sure it works.

This course is intended for intermediate to advanced learners who are preparing for their software engineer programming interviews.

So, I’m going to assume that you’re already familiar with concepts such as:

If you think you’re ready for this course, watch the preview videos and see if you can solve those problems!

Anyone who is currently preparing for coding interviews / programming interviews
Anyone who wants to improve their problem solving / coding skills in general (coding interviews are a good way to practice these skills)