7 Best Websites to Master Data Structure & Algorithm Skills

Here are 7 websites that offer various coding challenges and resources to help you learn and practice

Data structure and algorithm (DSA) skills are the foundation of computer science and software engineering. They enable you to design and implement efficient and elegant solutions for various computational tasks. Whether you want to prepare for a job interview, improve your coding skills, or learn new concepts, practicing DSA problems is a great way to achieve your goals. Fortunately, many websites offer DSA coding challenges and resources for learners of different levels and backgrounds.

1. LeetCode: LeetCode is one of the most popular platforms for preparing for technical interviews. It offers over 2,000 problems covering various topics such as arrays, linked lists, trees, graphs, stacks, queues, heaps, sorting, searching, dynamic programming, recursion, backtracking, bit manipulation, and more.

2. HackerRank: HackerRank is another popular platform for practicing DSA skills. It has dedicated sections for data structures and algorithms, where you can find hundreds of problems categorized by subdomains such as arrays, trees, heaps, sorting, graph theory, dynamic programming, and recursion.

3. Codewars: Codewars is a gamified platform that lets you improve your DSA skills by solving problems called kata. You can choose from thousands of kata created by the community or create your own. You can also filter the kata by difficulty level (from 8 kyu to 1 kyu), language (over 50 supported), or tag (such as algorithms or data structures). Each kata has a description, test cases, and solutions from other users.

4. Codility: Codility is a platform that helps companies hire software developers by assessing their DSA skills. It also provides a section for learners where they can practice DSA problems and get feedback on their performance. You can find problems on topics such as arrays, stacks, queues, sorting, searching, prefix sums, counting elements, leader elements, maximum slice problems, prime numbers, sieve of Eratosthenes, Fibonacci numbers, binary search algorithms, binary search trees, caterpillar method, greedy algorithms, dynamic programming, etc.

5. HackerEarth: HackerEarth is a platform that connects developers with companies looking for talent. It also offers a section for learners where they can practice DSA problems and learn from tutorials. You can find problems on topics such as basic programming, data structures, algorithms, math, machine learning, etc. You can also sort the problems by difficulty level (easy or medium) or track your progress on a skill map. HackerEarth also organizes regular coding competitions where you can win cash prizes and job opportunities.

6. Techie Delight: Techie Delight is a website that provides a collection of DSA problems with solutions in various languages such as C++, Java, Python, C#, JavaScript, etc. You can find over 500 problems on topics such as array strings, linked lists, binary trees, binary search trees, heaps, stacks, queues, graphs, hashing, sorting, searching, recursion, backtracking, dynamic programming, divide and conquer, greedy algorithms, bit manipulation, etc. You can also find articles and videos explaining the concepts and techniques behind the problems.

7. InterviewBit: InterviewBit is a platform that helps you prepare for technical interviews by providing DSA problems and mock interviews. You can find over 300 problems on topics such as arrays, math, binary search, strings, bit manipulation, two pointers, linked lists, stacks and queues, backtracking, hashing, heaps and maps, trees, dynamic programming, greedy algorithms, graphs, etc. You can also join peer-to-peer mock interviews where you can practice your DSA skills with other users or mentors. InterviewBit also offers courses and career guidance to help you land your dream job.