Reference

• Big-O Cheat Sheet
• Big O Reference
• Master Theorem

Recommended Reading

• The Algorithm Design Manual — Steven S Skiena
• Algorithms — Robert Sedgewick and Kevin Wayne
• Introduction to Algorithms — Cormen, Leiserson, Rivest, Stein
• Cracking the Coding Interview — Gayle Laakmann McDowell
• Head First Design Patterns — Freeman, Bates, Sierra, Robson

Other Quizzes

• GeeksQuiz: Algorithms
• C++ Quiz