Programming challenges & problems
online competitions, coding problems
Submit problems & Monthly Challenges
Try experimenting by submitting your code & get result instantly.
- Hacker Earth
- Hacker Rank
- CodeChef
- Techgig
- Sphere online judge
- ProgrammR
- Top Coder
- Challenge Post
- Coder Byte
- Codeforces
- Codeabbey
- Code Eval
- Codility
- Talent Buddy
- Pex4Fun
- PKU JudgeOnline
- Timus Online judge
- LeetCode
- Rank [Mathematics, Logic, Puzzle, cryptography, Steganography, CGI Security]
- CodeFights [Challenge bots, Interview prep, Tournaments, practice coding skills]
- Skillenza
- Edabit
- Codela
- CodeWars
- Kattis
- Stockroom
Competition
- Google code jam
- Al Zimmermann’s Programming Contests
- Xodia
- The Underhanded C Contest
- Internet Problem Solving Contest
- USA Computing Olympiad
- NCPC-programming contest
- HP CodeWars
- Apps for Goods
- Girl develop it
- Festival of Code
- ICFP Programming Contest
- The Loebner Prize in Artificial Intelligence
- Chatterbox Challenge
- Microsoft Imagine cup
- Unicom learning contests
- Hutter Prize (Compressing Human Knowledge)
- The International Obfuscated C Code Contest (C)
Hackathon
- Hackathon.io
- VR Hackathon
- Hackerleague
- Queens Hack
- Devpost
- Angelhack
- NY-Hackathons
- mlh.io
- Fiware
- Start hack
- Tribe Hacks
- Hack Princeton
- Hackgsu
- DefHacks
- WearHacks
- Grizzhacks
- Base ball Hackday
- Hack BCA
- Panther Hacks
- Bit Camp
- Hack DFW
- Hack Ru
- Hack UST
- Uncommon hacks
- Metro Hacks
- Cycle Hack
- Makerthon
- Hacks MHS
- Conu Hacks
- Messey Hacks
- Japacible-Hackathon calendar
Data science, AI, Machine learning
- Kaggle (Data science)
- DrivenData (Data science)
- Databits (Data Science)
- Analytics Vidhya (Data Science)
- TunedIT (data mining)
- Crowdanalytix (AI, NLP & Machine Learning)
- Halite AI (AI-bots)
- Knowledge Pit (Data Challenge)
- KDD (Data Mining and Knowledge Discovery)
- Challenges in Mahine learning
- Gov Challenge
Problems Hub (Archive)
- Project Euler
- Programming Praxis
- URI online judge
- UVa online judge
- TJU-ACM online judge
- British Informatics Olympiad
- IARCS Problems Archive
- Indian Computing Olympiad
- International Olympiad in informatics
- Hacker
- ACM International Collegiate programming contest
- CareerCup
- IBM Research-Ponder This
- IPCC-ACM
- SSU-ACM
- Google code jam
- Quora-challenges
- Daily Programmer-Reddit
Problems Hub - domain specific (Archive)
- Python Challenge
- codingbat (Java & Python)
- Rosalind [Bioinformatics & Python]
- RubyQuiz
- 4Clojure
domain specific contests
- Hackster (Hardware contests)
- Dream Challenges (biology & medicine)
- HackDay (All industries)
- Innocentive (All industries)
Learn coding while playing Games
- Check IO (Python & Javascript)
- Game of Hacks (application hacking)
- Vim-Adventures (Learn Vim)
- Code Combat (programming)
- The AI games (code your own bot)
- Codingame
- Screeps (open-source sandbox MMO RTS game for programmers)
- Robocode (develop a robot battle tank)
- Xodia
Others
- Planet source code [Already submitted problem]
- Happy coding [Problems statement & code]
- Coder Dojo [For little children]
- Code Golf
- Simple programming problems
- Mozilla Openbadges
- Coders Crowd (share your coding problem, ask review, connect with Programmers)
- DataKind (data science)
Blogs
- Open News (code conference announcements)
- Mozilla Hacks
- Dev articles
Tool
Code repository
This post is licensed under CC BY 4.0 by the author.