1. Programming Praxis
Programming Praxis is a blog that includes a range of interesting problems with solutions usually available in several different programming languages.
2. TopCoder
TopCoder is an active programming community of developers who love to solve puzzles. There are many active challenges and some of them with cash prizes.
3. Python Challenge
Python Challenge features riddles that ask you to write small Python programs to solve. The difficulty level gets progressively harder and more cryptic. This is an excellent site for programmers/developers that like problem solving!
4. C Puzzles
C Puzzles features programming puzzles specific to the C Programming language (and all of its quirks). Since many languages are C-style or derived directly from it, even if your native programming tongue isn’t C, there’s a strong likelihood that you’ll still appreciate and understand these puzzles.
5. Al Zimmermann’s Programming Contests
Al Zimmermann’s self-described “arena where demented computer programmers compete for glory and for some cool prizes” is a great way to participate in the programming community. Contests run every six months.
6. Project Euler
Quoted from their front page: “Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve ” The puzzles featured on the site range from relatively trivial to seriously complex!
7. Ruby Quiz
Ruby Quiz is a collection of Ruby programming challenges that is updated weekly. Although made for Ruby, these challenges can be solved in other languages.
8. Prolog Problems
Prolog Problems is suited to the Prolog programming language but people have provided solutions in Python, Ruby, Haskell, Scala and others. Working your way through these problems is a wonderful way to pick up a new language.
9. Mind Cipher
MindCipher is a social repository of the world’s greatest brain teasers, logic puzzles and mental challenges.
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