LeetCode in Java: Algorithms Coding Interview Questions from Udemy

What's inside

Learning objectives

Solve easy to hard difficulty problems using different data structures and algorithms (dsa)
Solve easy to hard difficulty problems
How to solve some of the classical coding interview questions

How to breaking down the coding interview problems in a decomposition manner
Strengthen your problem solving skills

Solve easy to hard difficulty problems using different data structures and algorithms (dsa)
Solve easy to hard difficulty problems
How to solve some of the classical coding interview questions
How to breaking down the coding interview problems in a decomposition manner
Strengthen your problem solving skills

Syllabus

Introduction

Intergers

FizzBuzz (LeetCode 412) [Asked by LinkedIn]

FizzBuzz

Single Number (LeetCode 136) [Asked by Amazon]

Single Number

Palindrome Number (LeetCode 9) [Asked by Facebook/Bloomberg]

Palindrome Number

Factorial Trailing Zeroes (LeetCode 172) [Asked by Microsoft]

Factorial Trailing Zeroes

Reverse Integer (LeetCode 7) [Asked by Facebook]

Reverse Integer

Pow(x, n) (LeetCode 50) [Asked by Facebook/Amazon/LinkedIn]

Pow(x, n)

Roman to Integer (LeetCode #13) [Asked by Google]

Roman to Integer

Integer to Roman (LeetCode #12) [Asked by Amazon]

Integer to Roman

Strings

Reverse String (LeetCode 344) [Asked by MicroSoft/Uber]

Longest Common Prefix (LeetCode 14) [Asked by Facebook]

Repeated DNA Sequences (LeetCode 187) [Asked by Google]

Valid Anagram (LeetCode 242) [Asked by Facebook]

Longest Palindromic Substring (LeetCode 5) [Asked by Facebook]

Longest Substring without Repeating Characters (LeetCode 3) [Asked by Google]

Reverse Words in a String (LeetCode 151) [Asked by Facebook/Amazon]

Integer to English Words (LeetCode 273) [Facebook, Microsoft]

Binary Search

Binary Search (LeetCode 704) [Asked by Infosys,Oracle]

Search in Rotated Sorted Array (LeetCode 33) [Asked by Facebook]

Find Minimum in Rotated Sorted Array (LeetCode 153) [Asked by Facebook]

Arrays

Two Sum (LeetCode 1) [Asked by Google]

Move Zeroes (LeetCode 283) [Asked by Facebook]

Best Time to Buy And Sell Stock(LeetCode 121) [Asked by Facebook/Microsoft]

Ransom Note (LeetCode 383) [Asked by Amazon]

Contains Duplicate (LeetCode 217) [Asked by Google]

Length of Last Word (LeetCode 58) [Asked by Amazon]

Best Time to Buy and Sell Stock II (LeetCode 122) [Asked by Google]

Rotate Array (LeetCode 189) [Asked by Microsoft]

Jump Game (LeetCode 55) [Asked by Google]

Product of Array Except Self (LeetCode 238) [Asked by Facebook]

Sequential Digits (LeetCode 1291) [Asked by Facebook]

Find All Disappeared Numbers in an Array (LeetCode 448) [Asked by Google]

Find All Duplicates Numbers in an Array (Leetcode 442) [Asked by Facebook]

First Missing Positive (LeetCode 41) [Asked by Microsoft]

Next Permutation (LeetCode 31) [Asked by Google]

Largest Subarray With 0 Sum [Asked by Microsoft]

Subarray Product Less than K (LeetCode 713) [Asked by Goldman Sachs]

K-Diff Pairs in an Array (LeetCode 532) [Asked by Amazon]

Two Pointers

Two Sum II - Input Array Is Sorted (LeetCode 167) [Asked by Amazon]

Is Subsequence (LeetCode 392) [Asked by Google]

Remove Duplicates from Sorted Array (LeetCode 26) [Asked by Facebook/Microsoft]

Sort Colors (LeetCode 75) [Asked by Facebook]

Valid Palindrome (LeetCode 125) [Asked by Facebook]

Merge Sorted Array (LeetCode 88) [Asked by Microsoft]

3 Sum (LeetCode 15) [Asked by Facebook]

Stacks and Queues

Valid Parentheses (LeetCode 20) [Facebook]

Asteroid Collisions (LeetCode 735) [Asked by Lyft]

Longest Valid Parentheses (LeetCode 32) [Asked by Google]

Decode String (LeetCode 394) [Asked by Google]

Largest Rectangle in Histogram (LeetCode 84) [Asked by Google]

Famous Algorithm

Kaden's Algorithm (Maximum Subarray :: LeetCode 53) [Asked by Google]

Boyer-Moore Voting Algorithm (Majority Element- LeetCode 169) [Asked by Amazon]

Sorting Algorithms

Merge Sort Algorithm [Asked by Amazon, Microsoft]

Count Inversions -- Using Merge Sort [Asked by Amazon, Microsoft]

Quick Sort Algorithm [Asked by Amazon, Microsoft]

Kth Largest/Smallest -- Quick Select (LeetCode 215) [Asked by Google, Microsoft]

[OLD] Quick Sort ::Sort an Array (LeetCode 912)

2D Arrays / Matrix

Set Matrix Zeroes (LeetCode 73) [Asked by Facebook]

Range Sum Query 2D - Immutable (LeetCode 304) [Asked by Amazon]

Where Will the Ball Fall (LeetCode 1706) [Asked by Amzon]

Rotate Image (LeetCode 48) [Asked by Microsoft]

Linked List

Middle of the Linked List (LeetCode 876) [Asked by Microsoft]

Delete Node in a Linked List (LeetCode 237) [Asked by Amazon,Microsoft]

Merge Two Sorted Lists (LeetCode 21) [Asked by Microsoft]

Reverse Linked List ::4 Ways:: (LeetCode 206) [Asked by Google, Facebook]

Reverse Nodes in k-group (LeetCode 25) [Asked by Microsoft]

Remove Duplicates from Sorted List ::O(N):: (LeetCode 83) [Asked by Microsoft]

Remove Duplicates from Sorted List ::O(1):: (LeetCode 83) [Asked by Microsoft]

Rotate List (LeetCode 61) [Asked by Microsoft]

Reorder List (LeetCode 143) [Asked by Amazon,LinkedIn,Microsoft]

Palindrome Linked List (LeetCode 234) [Asked by Microsoft]

Binary Tree

Code (Resource)

Tree Traversal Techniques (Level Order, Zigzag, Preorder, Inorder, Postorder)

Level Order Traversal Binary Tree (LeetCode 102) [Asked by Amazon, Microsoft]

Binary Tree Zigzag Level Order Traversal (LeetCode 103) [Asked by Microsoft]

Binary Tree Preorder Traversal (LeetCode 144) [Asked by Microsoft]

Binary Tree Inorder Traversal (LeetCode 94) [Asked by Microsoft]

Binary Tree Post Order Traversal (LeetCode 145) [Asked by Microsoft]

[Morris Traversal] Preorder Traversal (LeetCode 144) [Asked by Microsoft]

[Morris Traversal] Inorder Traversal (LeetCode 94) [Asked by Microsoft]

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Suitable for those seeking to prepare for coding interviews in the technology industry

Covers a wide range of LeetCode problems, increasing your exposure to various problem-solving techniques

Provides hands-on practice with real-world problems commonly encountered in technical interviews

Clear and detailed explanations of classical coding interview problems

Suitable for learners with varying backgrounds in programming, from those with some experience to those seeking to enhance their problem-solving skills

Covers essential data structures and algorithms, providing learners with a strong foundation for solving complex coding problems

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in LeetCode in Java: Algorithms Coding Interview Questions with these activities:

Coderbyte Algorithms and Data Structures

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Enhance your problem-solving skills by working through a variety of algorithmic challenges on Coderbyte.

Browse courses on Algorithms

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Select a problem that interests you.
Read the problem statement carefully.
Design and implement a solution.
Test your solution and refine it as needed.

LeetCode easy question practice

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Practice solving easy LeetCode problems to build a strong foundation in algorithms and data structures.

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Choose 5-10 LeetCode easy problems.
Solve the problems using your preferred programming language.
Review your solutions and identify areas for improvement.

Coding Interview University Blind 75

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Follow the structured guidance of Coding Interview University Blind 75 to master essential coding interview techniques and algorithms.

Browse courses on Coding Interview

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Review the problem list and identify your strengths and weaknesses.
Choose problems that align with your learning goals.
Work through the problems step-by-step, referring to the provided solutions when necessary.
Practice and revisit the problems regularly to reinforce your understanding.

Five other activities

Expand to see all activities and additional details

Show all eight activities

Personal LeetCode Problem Tracker

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Create a personalized LeetCode problem tracker to monitor your progress, identify areas for improvement, and stay motivated throughout your preparation.

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Set up a spreadsheet or use a dedicated app to track your LeetCode problems.
Categorize problems based on difficulty and topic.
Record your attempts, time spent, and solutions for each problem.
Regularly review your tracker to identify patterns and adjust your study plan.

LeetCode medium question practice

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Challenge yourself with medium LeetCode problems to enhance your problem-solving abilities and prepare for technical interviews.

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Select 3-5 LeetCode medium problems.
Work through the problems methodically.
Optimize your solutions for efficiency.

Neetcode 150

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Leverage the comprehensive Neetcode 150 resource to solidify your grasp of core coding interview concepts and problem-solving strategies.

Browse courses on Coding Interviews

Show steps

Review the curated list of 150 problems.
Watch the corresponding video explanations.
Practice solving the problems on your own.
Attend live Q&A sessions to clarify doubts and enhance your understanding.

Contribute to Open Source Projects

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Gain valuable hands-on experience and contribute to the broader tech community by participating in open source projects related to algorithms and data structures.

Browse courses on Open Source

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Identify open source projects that align with your interests and skill level.
Review the project's documentation and codebase.
Choose a feature or bug to work on.
Implement your solution and submit a pull request.
Collaborate with other contributors and maintain your contributions over time.

LeetCode hard question practice

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Engage with challenging LeetCode hard problems to push your limits and prepare for the toughest technical interviews.

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Identify 1-2 LeetCode hard problems.
Break down the problem into smaller subproblems.
Develop and implement efficient algorithms.
Test and analyze your solutions.

Career center

Learners who complete LeetCode in Java: Algorithms Coding Interview Questions will develop knowledge and skills that may be useful to these careers:

Algorithm Engineer

Algorithm Engineers specialize in designing and analyzing algorithms for solving complex problems. They develop efficient algorithms for various applications, such as search engines, recommendation systems, and optimization problems. This course in LeetCode in Java aligns well with the role of an Algorithm Engineer as it provides a deep understanding of algorithms, their time and space complexities, and their applications in real-world scenarios. By mastering these concepts, Algorithm Engineers can excel in their field and contribute to the development of innovative algorithms.

See salaries and explore the career path for Algorithm Engineer

Machine Learning Engineer

Machine Learning Engineers apply data structures and algorithms to design and develop machine learning models. They work on various projects, such as developing predictive models, building recommendation systems, and processing natural language. This course in LeetCode in Java can be a beneficial resource for Machine Learning Engineers as it provides a solid foundation in algorithms and data structures. By gaining proficiency in these concepts, Machine Learning Engineers can improve their ability to design and implement effective machine learning solutions.

See salaries and explore the career path for Machine Learning Engineer

Software Architect

Software Architects design and develop the overall architecture of software systems. They work on high-level design decisions, such as choosing appropriate algorithms and data structures for the system. This course in LeetCode in Java can be a valuable resource for Software Architects as it provides a deep understanding of algorithms and data structures. By mastering these concepts, Software Architects can make informed decisions about the design of software systems and ensure their efficiency and scalability.

See salaries and explore the career path for Software Architect

Data Scientist

Data Scientists utilize data structures and algorithms to extract insights from large datasets. They develop models and algorithms to analyze data, identify patterns, and make predictions. This course in LeetCode in Java can be a valuable asset for Data Scientists as it helps strengthen their understanding of algorithms and data structures. By becoming proficient in these concepts, Data Scientists can enhance their ability to handle complex data-intensive tasks and excel in their roles.

See salaries and explore the career path for Data Scientist

Quantitative Analyst

Quantitative Analysts use data structures and algorithms to analyze financial data and make investment decisions. They develop models to assess risk, identify trading opportunities, and manage portfolios. This course in LeetCode in Java can be highly beneficial for Quantitative Analysts as it provides a strong foundation in algorithms and data structures. By becoming proficient in these concepts, Quantitative Analysts can enhance their ability to analyze complex financial data and make informed investment decisions.

See salaries and explore the career path for Quantitative Analyst

Engineering Manager

Engineering Managers lead and manage teams of engineers, ensuring the successful delivery of software projects. They work closely with engineers to define project requirements, develop timelines, and track progress. This course in LeetCode in Java can be a valuable asset for Engineering Managers as it provides a practical understanding of software development processes and methodologies. By gaining insights into algorithms and data structures, Engineering Managers can effectively communicate with engineers, make informed decisions, and drive projects towards successful outcomes.

See salaries and explore the career path for Engineering Manager

Actuary

Actuaries utilize data structures and algorithms to assess risk and uncertainty in various fields, including insurance, finance, and healthcare. They develop models to predict future events, such as mortality rates and claim frequencies. This LeetCode in Java course can be a valuable asset for Actuaries as it provides a solid foundation in algorithms and data structures. By gaining proficiency in these concepts, Actuaries can enhance their ability to analyze data, develop accurate models, and make informed decisions in their field.

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Technical Program Manager

Technical Program Managers lead and manage technical projects, ensuring their successful delivery. They work closely with engineers and other stakeholders to define project requirements, develop timelines, and track progress. This course in LeetCode in Java can be a valuable asset for Technical Program Managers as it provides a practical understanding of software development processes and methodologies. By gaining insights into algorithms and data structures, Technical Program Managers can effectively communicate with engineers, make informed decisions, and drive projects towards successful outcomes.

See salaries and explore the career path for Technical Program Manager

Software Engineer

Software Engineers get the opportunity to use their knowledge of data structures and algorithms to design and implement robust software solutions. They use various programming languages and technologies to build and maintain complex systems. This course in LeetCode in Java can be a valuable resource for Software Engineers as it provides a comprehensive overview of essential coding interview questions and techniques. By understanding these concepts, Software Engineers can enhance their problem-solving skills and improve their performance in technical interviews.

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Data Engineer

Data Engineers design and build data pipelines to process and transform large volumes of data. They work on various projects, such as developing data warehouses, data lakes, and real-time data processing systems. This course in LeetCode in Java can be beneficial for Data Engineers as it provides a solid foundation in algorithms and data structures. By gaining proficiency in these concepts, Data Engineers can enhance their ability to design and implement efficient data pipelines and manage complex data-intensive tasks.

See salaries and explore the career path for Data Engineer

Data Analyst

Data Analysts use data structures and algorithms to clean, process, and analyze data. They work on various projects, such as identifying trends, developing visualizations, and making recommendations based on data insights. This course in LeetCode in Java can be beneficial for Data Analysts as it provides a solid foundation in algorithms and data structures. By gaining proficiency in these concepts, Data Analysts can enhance their ability to handle complex data-intensive tasks and communicate data-driven insights effectively.

See salaries and explore the career path for Data Analyst

Database Administrator

Database Administrators manage and maintain databases, ensuring data integrity and availability. They design and implement data structures to optimize database performance and efficiency. This course in LeetCode in Java can be beneficial for Database Administrators as it provides a solid foundation in data structures and algorithms. By gaining proficiency in these concepts, Database Administrators can enhance their ability to design and manage complex databases and ensure the smooth operation of data-driven applications.

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Product Manager

Product Managers define and manage the development of software products. They work closely with engineers and other stakeholders to gather requirements, prioritize features, and ensure product quality. This course in LeetCode in Java can be beneficial for Product Managers as it provides a practical understanding of software development processes and methodologies. By gaining insights into algorithms and data structures, Product Managers can effectively communicate with engineers, make informed decisions, and drive the development of successful software products.

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Project Manager

Project Managers plan, execute, and control projects to ensure their successful completion. They work closely with stakeholders to define project scope, develop timelines, and manage resources. This course in LeetCode in Java can be beneficial for Project Managers as it provides a practical understanding of software development processes and methodologies. By gaining insights into algorithms and data structures, Project Managers can effectively communicate with engineers, make informed decisions, and manage projects towards successful outcomes.

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Software Developer

Software Developers leverage data structures and algorithms to design, develop, and maintain software applications. They work closely with other engineers and stakeholders to gather requirements, design solutions, and implement them. This LeetCode in Java course can be particularly beneficial for Software Developers as it provides hands-on practice with coding problems commonly encountered in technical interviews. Mastering these concepts can significantly improve their chances of success in the competitive software industry.

See salaries and explore the career path for Software Developer