free-programming-books/problem-sets-competitive-programming.md

### Index

* [Competitive Programming](#competitive-programming)
* [Data science](#data-science)
* [Information security](#information-security)
* [Problem Sets](#problem-sets)


### Competitive Programming

* [4Clojure](http://www.4clojure.com)
* [A2 Online Judge](https://a2oj.com)
* [Caribbean Online Judge](http://coj.uci.cu)
* [Codeabbey](http://www.codeabbey.com)
* [Codechef](https://www.codechef.com/contests)
* [Codecombat](https://codecombat.com)
* [Codeeval](https://www.codeeval.com)
* [CodeFights](https://codefights.com)
* [Codeforces](http://codeforces.com/contests)
* [Coderbyte](https://coderbyte.com)
* [Codewars](http://www.codewars.com)
* [Codingame](https://www.codingame.com/start)
* [Facebook Hackercup](https://www.facebook.com/hackercup)
* [HackerEarth](https://www.hackerearth.com)
* [Hackerrank](https://www.hackerrank.com)
* [Internet Problem Solving Contest](http://ipsc.ksp.sk)
* [Just another Golf Coding](http://jagc.org)
* [Kattis](https://open.kattis.com)
* [LeetCode](https://leetcode.com)
* [Microcorruption](https://microcorruption.com/login)
* [Sphere Online Judge](http://www.spoj.com/contests)
* [Topcoder](https://www.topcoder.com)


### Data science

* [Kaggle](https://www.kaggle.com)


### Information security

* [ångstromCTF](https://angstromctf.com)
* [CTFtime](https://ctftime.org)


### Problem Sets

* [500 Data structures and algorithms interview questions and their solutions in C++](https://techiedelight.quora.com/500-Data-structures-and-algorithms-interview-questions-and-their-solutions-in-C%2B%2B)
* [A2 Online Judge](https://a2oj.com/ps)
* [Advent Of Code](http://adventofcode.com)
* [Anarchy Golf](http://golf.shinh.org)
* [CareerCup](http://www.careercup.com)
* [CheckIO](http://www.checkio.org)
* [Codeforces](http://codeforces.com/problemset)
* [Codility](https://codility.com/programmers/)
* [Coding Bat](http://codingbat.com/java)
* [Exercism](http://exercism.io)
* [Geeks For Geeks](http://www.geeksforgeeks.org)
* [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)
* [Hacker.org](http://www.hacker.org)
* [HackerEarth](https://www.hackerearth.com)
* [HDU Online Judge](http://acm.hdu.edu.cn)
* [Interactive Coding Challenge](https://github.com/donnemartin/interactive-coding-challenges)
* [InterviewBit](https://www.interviewbit.com)
* [Kattis](https://open.kattis.com)
* [Leetcode](https://leetcode.com)
* [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)
* [PEG Judge](http://wcipeg.com)
* [PKU Online Judge](http://poj.org)
* [Ponder This!](https://www.research.ibm.com/haifa/ponderthis/index.shtml)
* [ProblemBook.NET](https://github.com/AndreyAkinshin/ProblemBook.NET)
* [Project Euler](https://projecteuler.net)
* [Python Practice Projects](http://pythonpracticeprojects.com)
* [Rosalind](http://rosalind.info/problems/locations/)
* [Sphere Online Judge](http://www.spoj.com/problems/classical)
* [TalentBuddy](http://www.talentbuddy.co/blog/)
* [Timus Online Judge](http://acm.timus.ru)
* [URI Online Judge](https://www.urionlinejudge.com.br/judge/login)
* [UVa Online Judge](https://uva.onlinejudge.org/index.php?Itemid=8&option=com_onlinejudge)
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`### Index`
Formatting all files according to guidelines 2015-11-13 13:25:42 +00:00
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`* [Competitive Programming](#competitive-programming)`
Create data science section and add Kaggle to it. 2016-05-25 10:39:23 +00:00			`* [Data science](#data-science)`
add CTFtime to problem-sets-competitive-programming.md (#3468) * -_- * -_- * -_- 2019-12-11 13:33:50 +00:00			`* [Information security](#information-security)`
Fix formatting 2016-05-27 21:19:21 +00:00			`* [Problem Sets](#problem-sets)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00

			`### Competitive Programming`
Formatting all files according to guidelines 2015-11-13 13:25:42 +00:00
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [4Clojure](http://www.4clojure.com)`
Modification and New Addition of Links (#2016) * Modification and New Addition of Links Modified some links to reach the specific page and added some more links to programming contest and problem set. * Corrected sequence of links * Ruby Interactive Tutorial Added 2016-08-01 12:53:03 +00:00			`* [A2 Online Judge](https://a2oj.com)`
Caribbean Online Judge added (#2655) 2017-11-25 04:00:17 +00:00			`* [Caribbean Online Judge](http://coj.uci.cu)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Codeabbey](http://www.codeabbey.com)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [Codechef](https://www.codechef.com/contests)`
Added Python Books 'Think Complexity & 'How to Make Mistakes in Python' 2017-01-03 17:42:16 +00:00			`* [Codecombat](https://codecombat.com)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Codeeval](https://www.codeeval.com)`
Added Codefights to problem sets and competitive programming 2016-03-08 18:09:54 +00:00			`* [CodeFights](https://codefights.com)`
Modification and New Addition of Links (#2016) * Modification and New Addition of Links Modified some links to reach the specific page and added some more links to programming contest and problem set. * Corrected sequence of links * Ruby Interactive Tutorial Added 2016-08-01 12:53:03 +00:00			`* [Codeforces](http://codeforces.com/contests)`
Remove trailing slashes 2015-12-13 21:07:27 +00:00			`* [Coderbyte](https://coderbyte.com)`
			`* [Codewars](http://www.codewars.com)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [Codingame](https://www.codingame.com/start)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`* [Facebook Hackercup](https://www.facebook.com/hackercup)`
added link to HackerEarth (#2174) 2017-01-02 20:12:28 +00:00			`* [HackerEarth](https://www.hackerearth.com)`
Fix formatting 2017-01-02 20:19:33 +00:00			`* [Hackerrank](https://www.hackerrank.com)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Internet Problem Solving Contest](http://ipsc.ksp.sk)`
			`* [Just another Golf Coding](http://jagc.org)`
added Kattis to competitive programming and problem sets (#2143) 2016-11-03 22:06:02 +00:00			`* [Kattis](https://open.kattis.com)`
Update problem-sets-competitive-programming.md (#2890) * Update problem-sets-competitive-programming.md Added LeetCode platform in Competitive Programming section. * Update problem-sets-competitive-programming.md Added LeetCode platform in Competitive Programming 2018-06-11 03:15:29 +00:00			`* [LeetCode](https://leetcode.com)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [Microcorruption](https://microcorruption.com/login)`
Modification and New Addition of Links (#2016) * Modification and New Addition of Links Modified some links to reach the specific page and added some more links to programming contest and problem set. * Corrected sequence of links * Ruby Interactive Tutorial Added 2016-08-01 12:53:03 +00:00			`* [Sphere Online Judge](http://www.spoj.com/contests)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Topcoder](https://www.topcoder.com)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00

Fix formatting 2016-05-27 21:19:21 +00:00			`### Data science`

			`* [Kaggle](https://www.kaggle.com)`


add CTFtime to problem-sets-competitive-programming.md (#3468) * -_- * -_- * -_- 2019-12-11 13:33:50 +00:00			`### Information security`

add angstromctf.com (#3582) * -_- * add refactoring * add refactoring Co-authored-by: rndd <you@example.com> 2020-04-16 15:20:44 +00:00			`* [ångstromCTF](https://angstromctf.com)`
add CTFtime to problem-sets-competitive-programming.md (#3468) * -_- * -_- * -_- 2019-12-11 13:33:50 +00:00			`* [CTFtime](https://ctftime.org)`


Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`### Problem Sets`
Formatting all files according to guidelines 2015-11-13 13:25:42 +00:00
Update problem-sets-competitive-programming.md (#2288) 2017-03-11 14:05:25 +00:00			`* [500 Data structures and algorithms interview questions and their solutions in C++](https://techiedelight.quora.com/500-Data-structures-and-algorithms-interview-questions-and-their-solutions-in-C%2B%2B)`
Modification and New Addition of Links (#2016) * Modification and New Addition of Links Modified some links to reach the specific page and added some more links to programming contest and problem set. * Corrected sequence of links * Ruby Interactive Tutorial Added 2016-08-01 12:53:03 +00:00			`* [A2 Online Judge](https://a2oj.com/ps)`
Added advent of code. Closes #1773 2016-01-31 03:20:48 +00:00			`* [Advent Of Code](http://adventofcode.com)`
Corrected alphabetical ordering for advent of code 2016-02-02 06:37:09 +00:00			`* [Anarchy Golf](http://golf.shinh.org)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [CareerCup](http://www.careercup.com)`
			`* [CheckIO](http://www.checkio.org)`
Added Python Books 'Think Complexity & 'How to Make Mistakes in Python' 2017-01-03 17:42:16 +00:00			`* [Codeforces](http://codeforces.com/problemset)`
Removed typo 2015-06-10 14:29:41 +00:00			`* [Codility](https://codility.com/programmers/)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`* [Coding Bat](http://codingbat.com/java)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Exercism](http://exercism.io)`
changed https to http for geeksforgeeks.org link 2016-03-12 16:42:10 +00:00			`* [Geeks For Geeks](http://www.geeksforgeeks.org)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`* [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Hacker.org](http://www.hacker.org)`
			`* [HackerEarth](https://www.hackerearth.com)`
New resources for competitive programming 2016-07-04 10:13:21 +00:00			`* [HDU Online Judge](http://acm.hdu.edu.cn)`
Update problem-sets-competitive-programming.md 2017-04-03 13:50:03 +00:00			`* [Interactive Coding Challenge](https://github.com/donnemartin/interactive-coding-challenges)`
Add InterviewBit to problem sets 2015-12-02 13:53:02 +00:00			`* [InterviewBit](https://www.interviewbit.com)`
added Kattis to competitive programming and problem sets (#2143) 2016-11-03 22:06:02 +00:00			`* [Kattis](https://open.kattis.com)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Leetcode](https://leetcode.com)`
Created 'problem-sets-en.md' #1191 Mainly its the base we all could (and in my opinion should) build on. 2014-11-16 19:10:38 +00:00			`* [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [PEG Judge](http://wcipeg.com)`
			`* [PKU Online Judge](http://poj.org)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [Ponder This!](https://www.research.ibm.com/haifa/ponderthis/index.shtml)`
Fix Broken Links (#2603) * Replace homepage with GitHub repository link problem-sets-competitive-programming.md: Replace homepage link of problembook with github repository link which contains downloadable pdf links. * Remove broken links Remove broken links and update available links from web.archive.org. * Update broken link with updated link. Update the description for the updated link. * Update broken links with links from web.archive.org Remove dead links. * Restore path to original link instead of web.archive.org The link seems to be working fine. It was not loading on my network, probably due to regional restrictions. * Remove github link which is no longer maintained. Github link consisted of list of Big Data resources. The repository has been deleted by the user. Hence deleting the entry. 2017-10-23 13:53:01 +00:00			`* [ProblemBook.NET](https://github.com/AndreyAkinshin/ProblemBook.NET)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Project Euler](https://projecteuler.net)`
			`* [Python Practice Projects](http://pythonpracticeprojects.com)`
Update problem-sets-competitive-programming.md 2015-01-27 17:00:32 +00:00			`* [Rosalind](http://rosalind.info/problems/locations/)`
Modification and New Addition of Links (#2016) * Modification and New Addition of Links Modified some links to reach the specific page and added some more links to programming contest and problem set. * Corrected sequence of links * Ruby Interactive Tutorial Added 2016-08-01 12:53:03 +00:00			`* [Sphere Online Judge](http://www.spoj.com/problems/classical)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [TalentBuddy](http://www.talentbuddy.co/blog/)`
Remove all trailing slashes 2015-11-13 20:52:57 +00:00			`* [Timus Online Judge](http://acm.timus.ru)`
Update problem-sets-competitive-programming.md 2015-01-27 15:57:24 +00:00			`* [URI Online Judge](https://www.urionlinejudge.com.br/judge/login)`
Update URLs based on redirects 2015-12-13 17:32:57 +00:00			`* [UVa Online Judge](https://uva.onlinejudge.org/index.php?Itemid=8&option=com_onlinejudge)`