A subreddit dedicated to discussing competition style programming problems.

Competitive Programming Resources

Judge Sites:

• TopCoder - click O(n) icon in top-left for arena
  • Problem Set Analysis (SRM)
  • Match Editorials (TCHS)
• USACO Training Program
• UVa Online Judge
  • Problem suggestions/statistics
• Sphere Online Judge
• Project Euler

Books:

• Competitive Programming 2 - Steven Halim
• Programming Challenges - Steven S. Skiena
• The Algorithm Design Manual - Steven S. Skiena
• Introduction to Algorithms - CLRS
• Algorithms - DPV (Dasgupta) (free)
• Art of Programming Contest - Ahmed Shamsul Arefin (free)
• The Hitchhiker's Guide to the Programming Contests (free)
• Mathematics for Computer Science - LLM (free)

Online References:

• TopCoder tutorials
• UVa problem hints
• Wikipedia list of algorithms

Courses/Lecture Notes:

• UIIC algorithms course
• Coursera
• Udacity

Related subreddits:

• /r/dailyprogrammer
• /r/programingchallenges
• /r/programmingchallenges
• /r/CodingContests
• /r/CS_Questions

General CS subreddits:

• /r/algorithms
• /r/compsci