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10 websites to practice coding problems: Our picks

Whether you're just starting out as a coder or want to advance your coding skills, tackling programming problems is part of the plan. 

Convenient, free, and even fun, coding problem websites challenge your abilities with individual exercises, friendly challenges, and insightful assessments.

Practicing your coding through these websites may increase your knowledge, build your skills, and prepare you for programming job interviews. 

Top websites for practicing your coding skills

Should a humanities major learn to code.

Can a humanities student learn coding? Absolutely. Coding is not strictly for STEM students — it can benefit you no matter your degree.

How hard is it to learn coding ? Starting from scratch can be difficult, but coding challenges designed to test and advance your skills may help. We rounded up 10 great websites for coding problems and listed them alphabetically for you. 

Each website offers a collection of resources for learning coding or advancing what you already know. 

1. CodeChef

CodeChef lets you choose among thousands of problems to practice skills like sorting, data structures, and dynamic programming. Problems are sortable by difficulty. Code Chef's practice problems allow you to answer in one of over 50 programming languages as you prepare for its internal or external monthly contests. 

CodeChef offers self-guided learning opportunities and mentoring programs alongside a community of coders, coding bootcamps, and tech certification programs. 

2. Coderbyte

Designed for coding practice and improvement, Coderbyte offers code challenges and courses aimed at helping you prepare for job interviews. 

Coderbyte had over three million solutions with challenges in more than 25 languages. Starter courses in algorithms, JavaScript, Ruby, and Python accompany interview kits and career resources. 

You can sign up for a free challenge and free trial. A monthly subscription to Coderbyte costs $35 and an annual subscription is $150. Both give you access to all of Coderbyte's resources. 

3. Codewars

Launched in 2012, Codewars provides practice kata, or small coding exercises, that you advance through as you build your skills. Codewars' kata are available in nearly 60 programming languages and in levels from beginner to advanced.

You can develop your own kata, engage with the Codewars community, and master one or multiple languages in the process. Feedback and creative learning facilitate creative thinking and innovation among Codewars' users. Codewars offers resources for educators and companies as well. 

4. CodinGame

With more than 25 supported languages, CodinGame provides challenge-based programming training through games, puzzles, and competitions. 

CodinGame's resources let you build your programming abilities, learn new concepts, and interact with fellow coders through easy, medium, hard, and very hard exercises.

CodeinGame's leaderboard and prizes earn you recognition from your peers and track your progress. Free live streams, blogs, and discussion forums for developers accompany sourcing, screening, and retention programs for recruiters. 

5. Geektastic

With human-reviewed technical assessments, Geektastic lets companies customize coding challenges for talent acquisition and engineering team training. If you have coding experience, you can join Geektastic's reviewer community to create and test those challenges — and get paid to review candidates' performance. 

Code challenges are offered in Java, Python, and PHP. Geektastic also offers skills assessments in Java, Javascript, and basic coding. Joining as a developer comes with no cost, while flexible pricing accommodates businesses of any size. 

6. HackerRank

HackerRank serves as a technical interview platform, but also provides coding practice to over 18 million users. Challenges offered by HackerRank cover topics including algorithms, Java, Python, Ruby, and data structures. 

HackerRank's challenges allow you to test your code, debug it, and win one of its sprint, company, language, or timed challenges. You can also earn certifications in specific skills or complete interview preparation kits. Pricing ranges from $25/month for interview content to $819/month team subscriptions.

7. LeetCode

LeetCode provides more than 2,250 practice problems to its programmer community. Individual challenges in topics like algorithms, database structures, and dynamic programming accompany entire study plans. 

LeetCode's programming skills study plan integrates three modules offered at easy, medium, or hard difficulty levels. LeetCode supports 14 programming languages and houses a playground tool to help you test, debug, and write code. 

Sign-up is free. LeetCode Premium offers access to additional tools and premium content for a monthly subscription of $35 or an annual fee of $159. 

8. Project Euler

Named for mathematician Leonhard Euler, Project Euler began in 2001. Recent and archival content is available for registered users at no cost. 

Project Euler offers computational programming problems combining mathematics with computer and programming skills. With 108 programming languages and more than one million users, Project Euler provides problems with varying difficulty.

Sphere Online Judge, or SPOJ , trains users to code and build efficient algorithms through more than 20,000 practice problems. Scoring categories for problems include challenges, tutorials, and riddles. Rankings and a status board accompany running contests that support more than 45 programming languages and compilers. 

SPOJ offers a flexible testing system to automatically assess user-submitted programs. Users can design their own contests or take part in an online course at all programming levels, but it is ideal for students.

10. TopCoder

TopCoder's community of designers, developers, data scientists, and competitive programmers build their skills, show their expertise, and earn money as they improve their coding abilities. TopCoder pays individuals for their work, sells it to corporate clients, and hosts competitions designed to highlight top coding talent worldwide.

Customers use TopCoder to hire freelancers on-demand, set challenges for the coding community, and find teams for projects.

This article was reviewed by Monali Mirel Chuatico

In 2019, Monali Mirel Chuatico graduated with her bachelor's in computer science, which gave her the foundation that she needed to excel in roles such as data engineer, front-end developer, UX designer, and computer science instructor.

Monali is currently a data engineer at Mission Lane. As a data analytics captain at a nonprofit called COOP Careers , Monali helps new grads and young professionals overcome underemployment by teaching them data analytics tools and mentoring them on their professional development journey.

Monali is passionate about implementing creative solutions, building community, advocating for mental health, empowering women, and educating youth. Monali's goal is to gain more experience in her field, expand her skill set, and do meaningful work that will positively impact the world.

Monali Mirel Chuatico is a paid member of the Red Ventures Education Integrity Network. 

Last reviewed April 21, 2022.

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The 8 Best Coding Challenge Websites to Help You Level Up Your Skills in 2020

Despite the lowest unemployment rate in decades, analysts expect technology hiring to continue growing steadily into the 2020s.

That’s great news for recent computer science graduates and developers currently working in the field, but that doesn’t mean ambitious engineers can get complacent.

While there will likely be growth opportunities in the market overall, there are still significant changes happening all the time, and a sense of urgency to keep up with the latest trends.

Today, there are more types of technical roles than ever before, and a continued proliferation of new languages, frameworks, and technologies. Technical employees that want to get ahead should routinely test and refine their skills.

To that end, I’ve put together the following list of platforms where you can level up your skills for any number of roles, from data science to developer operations.

1. freeCodeCamp

Helpful links: Website | Forum | Challenges

Let's begin with freeCodeCamp, which is a great website for beginners who are just getting into coding. They offer all sorts of resources on learning syntax, practicing coding, building projects, and preparing for interviews.

They don’t have as many interactive coding challenges as other sites, but they do offer some fun challenges and interview prep for beginners learning JavaScript.

Novices who are just learning to code for the first time. It’s a great place to learn HTML, CSS, and JavaScript in a fun, interactive way.

Pricing / Premium content

freeCodeCamp is completely free.

2. Coderbyte

Helpful links: Website | Blog | Dev.to | Free Challenges | Premium

My platform, Coderbyte, provides 300+ coding challenges you can solve in an online editor using 10 different programming languages. You can then access official solutions, over 1.5 million user solutions, and read articles on how to efficiently solve the challenges.

Coderbyte is recommended by the top coding bootcamps and companies because of its collection of interview prep challenges.

Coderbyte is perfect for people in the beginner-to-intermediate phase of their careers who are preparing for interviews. There is a library of harder challenges as well for those who like to solve coding problems for fun, but this isn’t primarily a site for competitive programmers.

There are a handful of free challenges on Coderbyte, and then there are hundreds of premium challenges and over 1 million user solutions that are available to members .

3. LeetCode

Helpful links: Website | Discussion | Free Challenges | Premium

LeetCode has a collection of some of the best algorithm challenges online today. The topics they cover require knowledge of data structures such as binary trees, heaps, linked lists, and so on, which is why their challenges are a bit more advanced than some other websites. But the challenges are great if used to prepare for a software engineering interview.

They also have a Mock Interview section that is specifically for job interview preparation. They also host their own coding contests , and they have a great discussion board where people talk about interview questions, jobs, compensation, and other topics related to engineering.

LeetCode is great for intermediate-to-advanced programmers. It might not be the best suited for brand new coders who don’t know how to write basic loops yet, but once you learn the fundamentals this is a great site to practice coding.

There are free challenges available on LeetCode, and they also have a premium subscription which gets you access to more challenges and other features of the platform.

Helpful links: Website | Blog | Challenges

This is the first time Edabit is appearing on our top sites list ( 2018 list , 2017 list )! It has grown in popularity over the last year, and developers seem to really enjoy the challenges. They offer a large collection of over 4,000 challenges that can be solved online in one of several languages.

The site currently only offers online interactive coding challenges — there aren’t any discussion boards, articles, user solutions, or mock interviews like other sites offer, but over time they might be adding some of these.

Edabit is great for beginners looking to practice their coding skills daily by solving bite-sized challenges. Once you reach the intermediate stage, other sites provide harder challenges and more content geared towards competitive programming and job interviews.

All the challenges on Edabit are free, and there is no premium pricing option.

5. Codewars

Helpful links: Website | Blog | Free Challenges | Premium

Codewars provides a large collection of coding challenges submitted and edited by their own community. You can solve the challenges directly online in their editor using 20+ programming languages. You can view a discussion for each challenge as well as user solutions. You can earn points and climb the rankings by solving their challenges.

Codewars is great for people in the beginner-to-intermediate phase. The challenges are created by the community so you get exposed to a lot of different types of coding challenges.

They offer all of their challenges created by the community for free, and their premium subscription gets you access to some cool features on their platform.

6. HackerRank

HackerRank has a large collection of coding challenges tailored towards algorithms and data structures, along with interview prep material, a discussion board for each challenge, and a list of top user solutions. They have challenges for other topics as well like functional programming, AI, Shell, SQL, and more.

HackerRank is great for intermediate-to-advanced programmers who have already picked up the basics of a language and are ready to solve more complicated problems. The challenges are written with mathematical notation and can sometimes be a little confusing, which is why it might not be so great for beginner developers.

All the challenges on HackerRank are free, and there is no premium pricing option.

7. TopCoder

TopCoder is one of the original platforms for competitive programming online. It provides a list of algorithmic challenges from past competitions that you can complete on your own directly online using their code editor.

Their popular Single Round Matches are offered a few times per month at a specific time where you compete against others to solve challenges. Here are some topics that their challenges may cover.

Aside from solving challenges for fun online, they offer sponsored competitions where you can win prizes for writing the best solution.

TopCoder is better suited for advanced programmers who are comfortable solving algorithm challenges dealing with advanced topics like graph search and number theory.

All the challenges on TopCoder are free, and there is no premium pricing option.

8. Codeforces

Helpful links: Website | Discussion | Challenges

Codeforces is now probably the top competitive programming website (a few years ago TopCoder was where most competitive programmers spent their time).

There are problems that you can solve online to practice, but there’s no online editor. Rather, you write your solution in your own editor and then upload it to their system which then tests your code against a suite of test cases.

They also frequently hold contests where the best competitive programmers take part in.

Advanced and competitive programmers who truly enjoy solving difficult algorithm challenges.

All the challenges on Codeforces are free, there is no premium pricing option.

CEO & Founder at Coderbyte.

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Posted on Aug 12, 2021 • Updated on Sep 12, 2021

11 Websites To Practice You Coding And Your Problem Solving Skills

11 websites to practice your coding and problem-solving skills.

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Achieve mastery through challenge

Improve your development skills by training with your peers on code kata that continuously challenge and push your coding practice.

Sharpen your coding skills

Challenge yourself on small coding exercises called "kata". Each kata is crafted by the community to help you strengthen different coding techniques. Master your current language of choice, or quickly pick up any of the 55+ programming languages supported.

Get instant feedback

Solve kata with your coding style right in the browser and use test cases (TDD) to check it as you progress. Retrain with new, creative, and optimized approaches. Find all of the bugs in your programming practice.

Earn ranks and honor

Kata code challenges are ranked from beginner to expert level. As you complete higher-ranked kata, you level up your profile and push your software development skills to your highest potential.

An engaged software development community

Codewars is a collective effort by its users. They are creators—authoring kata to teach various techniques, solving kata with solutions that enlighten others, and commenting with constructive feedback.

Community members added every month

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Tap into the collective wisdom

Compare your solution with others after each kata for greater understanding. Discuss kata, best practices, and innovative techniques with the community. Have your mind blown by how different other solutions can be from your own.

Create your own kata

Author kata that focus on your interests and train specific skill sets. Challenge the community with your insight and code understanding. Create everything from common developer interview questions to challenges that push the limits of your creativity. Gain honor within the coding dojo.

What can I use Codewars for?

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Compete against your friends, colleagues, and the community at large. Allow competition to motivate you  towards mastering your craft.

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Build self-confidence

Not sure if you are progressing well as a programmer? Push yourself to your limits and show yourself what you are really made of.

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Lend your expertise to others, either indirectly by contributing great solutions or directly by creating your own kata and reviewing code.

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Starting the journey of programming and competitive coding , every coder wants to test himself/herself in the waters. To do so, he/she has to participate in various competitive coding challenges and competitions. But the challenge that every coder faces in the beginning of the journey is which website to go for such coding challenges and competitions, which is the best website for coding competitions, what is the benefit of attending a competitive coding competition, and many more.

In this article, we have addressed the questions that you face in such situations and curated a list of top 15 websites for coding challenges and competitions. If you are about to begin your coding journey, we recommend you to refer to this article for a complete reference of the opportunities you can take advantage of using the mentioned websites for coding challenges and competitions.

Here are the top 15 coding websites/contests for competitive programming:

1. GeeksForGeeks

GeeksForGeeks organizes a bunch of programming contests every month through the practice portal which includes a number of job-a-thons for freshers to get hiring opportunities in a significant number of companies. Besides, there are many other monthly, weekly and daily basis challenges hosted regularly on the websites such as:

• Monthly Job-a-thon : It is a contest for individual participants. Participants get the opportunity to get hired by a bunch of companies that shortlist for interviews as per their own criteria.
• Bi-Wizard Coding : A coding competition exclusively for students. The top 100 students get chances of winning exciting rewards and also access to free courses.
• Aim GATE : A monthly challenge that is a great opportunity for GATE aspirants to judge their preparations.
• Interview Series : A weekly challenge that gives a great opportunity for aspirants to practice a lot of questions based on important data structure and algorithms concepts for the preparation of interviews.
• Problem of the Day : A new problem every day to strengthen the base of data structure and algorithm.

The key features about the contests are as follows:

• Chances of winning exciting rewards, GeeksForGeeks merchandise .
• Access to free courses .
• Chances of getting letter of recommendation from the CEO .

2.  The ACM-ICPC International Collegiate Programming Competitions

The International Collegiate Programming Contest is an algorithmic programming contest for college students. Teams of three, representing their university, work to solve the most real-world problems, fostering collaboration, creativity, innovation, and the ability to perform under pressure. Through training and competition, teams challenge each other to raise the bar on the possibility. Quite simply, it is the oldest, largest, and most prestigious programming contest in the world. Some interesting stats about ACM-ICPC are:

• It is spread across 80 countries
• The registration for the contest in India starts generally in August .
• The regionals in India are held generally in December
• The winner of the world finals gets an award of $15000 , each continental champion also receives awards. There are also prizes for being the first solver of a problem

Refer to our complete guide on How to prepare for ACM – ICPC to begin your ACM-ICPC journey.

3. Google Kick Start

Google Kick Start is a global online coding competition, consisting of three-hour rounds of a variety of algorithmic challenges designed by Google engineers. Participants can compete in one or all online rounds held throughout the year, and will have the opportunity to develop and grow their programming abilities while getting a glimpse into the technical skills needed for a career at Google. Some important facts about Google Kick Start are:

• It consists of 8 online coding rounds.
• The winner gets cash prizes .
• Top participants may be invited to interview at Google .

Refer to our complete guide on How to prepare for Google Kick Start to begin your Google Kick Start journey.

4. Google Code Jam

Google Code Jam is Google’s prestigious coding competition, a global battleground that urges all programmers to showcase their coding skills. A thrilling opportunity for all code-lovers, Google Coding Jam is a one-of-a-kind platform where programmers are pitted against each other and against time by putting their coding skills to the test. The champion gets the coveted Google Code Jam winning title and cash prize of $15,000 !

The Google Coding Jam comprises several rounds and a Code Jam World final. Each round brings with it challenging algorithmic problems; contestants have to pass each of these preliminary rounds, and finally, a total of 25 coding wizards reach the end game to fight for the cherished champion’s title.

You can also see and try previous year’s problems from our Google Code Jam archive page.

5. Google Hash Code

Hash Code is a team programming competition, organized by Google, for students and professionals around the world. You pick your team and programming language and we pick an engineering problem for you to solve. This year’s contest kicks off with a Qualification Round, where your team can compete virtually from wherever you’d like, alongside your virtual Hub. Top teams will then be invited to compete in our virtual World Finals. Some facts about Google Hash Code are:

• Registration generally starts in February .
• Winners get cash prize of $4000 .

You can also see and try previous year’s problems from their Google Hash Code archive page.

6. The ICFP Programming Competitions

The International Conference on Functional Programming (ICFP) has been held annually since 1998. It is a challenging three-day open programming competition for which there is no entry fee. The enthusiast can participate from any location without any size limit for team formation. The team will be given 72 hours to complete and submit their entry through the internet. The aim of this competition is to showcase the programming languages and tools that the participants admire the most. This is one of the top programming competitions to apply for.  The ICFP for 2022 will be from 11th to 16th September .

7. Facebook Hacker Cup

Hacker Cup is Facebook’s annual open programming competition which is open across the world for participants. This is one of the top programming competitions to apply for. These coding competitions focus on problem-solving and algorithmic coding skills to advance through every year’s online rounds, and after making it to the global finals they will be earning the grand prize. Some facts about Facebook Hacker Cup:

• It consists of 4 online rounds which include Qualification round, round 1, round 2, round 3 and one onsite final round .
• All of the 25 finalists get cash prizes .

Refer to our complete guide on How to prepare for Facebook Hacker Cup to begin your Facebook Hacker Cup journey.

8. Microsoft Imagine Cup

Microsoft Imagine Cup is held annually. The program invites participants to take on real-world problems that are submitted by NGOs, IGOs , and nonprofit organizations that can then take on as part of the Imagine Cup project. The main idea behind conducting such coding competitions and programming competitions is to code with a purpose that can help create new solutions. Some important facts about Microsoft Imagine Cup:

• You must be at least 16 years old and actively registered as a student .
• Students participate in a team of maximum 4 persons .
• There are cash prizes and other benefits like training and mentorship from experts for global finalists.
• There are also three regional finals.

9. Codeforces Coding Competitions

Codeforces is a website that hosts competitive programming competitions. It is one of the most popular websites for its exciting features. This is one of the top programming competitions to apply for. The polygon feature for creating and testing problems and social networking through internal public blogs. The participants are divided into ranks based on their ratings.

The best thing about Codeforces is that the contests are regularly conducted here as every month they organize nearly 6 contests. Also, participation in the contests is free and open to everybody.

 Codeforces offers various types of coding challenges and features such as:

• Short format Contests with a duration of 2 hours .
• Educational Contests of 2-2.5 hours duration are conducted 2-4 times in a month.
• You can challenge or hack other contestants’ solutions as well.
• You can also solve problems from previous contests for learning objectives.

Refer to our complete guide on Best Tips to Get Started with Codeforces to begin your Codeforces journey.

10. Codechef Coding Competitions

CodeChef organizes programming competitions at the start of every month and conducts two smaller programming contests at the middle and end of the month. It also offers various algorithm tutorials and forum discussions to help your journey in computer programming more easily.

There are four types of contest Codechef host:

• The Starters
• The Long Challenge
• The Cook-Off
• The LunchTime

Refer to our complete guide on How to become a 4 star coder on Codechef in only 3 contests to help you kickstart your Codechef journey.

11. Topcoder Coding Competitions

Topcoder is a crowdsourcing company with a global community of developers, designers, data scientists, and competitive programmers . These coding competitions are conducted twice a year and are held both online and offline. The participants take challenges from across the world from all the leading brands such as Google, IBM, and eBay . They also conduct individual matches online every week that can help participants gain experience and do well in the competition.

12. Atcoder Coding Competitions

AtCoder is a programming contest website based in Japan. From this weekend, we will provide problem statements in both English and Japanese and AtCoder will be an international programming competition! There are three types of official contests in AtCoder:

• AtCoder Grand Contest (AGC) . This is our best contest. The problems will have high originality and require interesting observations.
• AtCoder Regular Contest (ARC) . The problems may be a bit typical compared to AGC problems, but still, we think most of you can enjoy them and they are good for practice.
• AtCoder Beginner Contest (ABC ). This is mainly targeted at those who are new to competitive programming. The problems will be easy and educational.

13. HackerEarth

HackerEarth is an Indian software company headquartered in San Francisco, US, that provides enterprise software that helps organizations with their technical hiring needs. HackerEarth is used by organizations for technical skill assessment and remote video interviewing. All challenges organized by HackerEarth are listed on the Challenges Page. These challenges can be divided into the following categories. Monthly Programming Contests: Currently they have 3 monthly contests based on difficulty level. 1st of every month from 21:30 IST (16:00 UTC) to Midnight for a duration of 2 hours & 30 minutes. The website offers thoughtful challenges mostly good for experienced programmers. They host monthly coding challenges and hackathons. Their challenge Code Monk is quite popular among programmers. ThoughtWorks , Amazon , Accenture , Walmart Labs , IBM , and Intuit are some leading companies of HackerEarth.

14. HackerRank

HackerRank is a competitive coding platform where it allows you to practice various coding problems and participate in many challenges. It provides various hackathons, and coding challenges and some companies conduct their hiring test here. The platform also gives you badges by solving challenges on the HackerRank website, and these badges will be added to your profile. This is one of the top programming competitions to apply for.

15. Leetcode

Leetcode is one of the largest tech communities with more than millions of active users. It offers various weekly and biweekly programming competitions for the participants. This also helps in job interview preparation; discussions are also provided on LeetCode. It hosts contests for 90 minutes where you can solve the challenges in their online editor, aka, playground in any one of the supported programming languages.

Conclusion:

Though the above mentioned coding websites are very common, there are other websites as well that are widely used by other users worldwide for coding practice and challenges, such as:

• Khan Academy
• and many others.

Related Posts:

• Stuck in Programming: Get The Solution From These 10 Best Websites
• 10 Best Coding Games to Advance Your Programming Skills  

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