Big-O

http://bigocheatsheet.com

Recursion

https://users.cs.duke.edu/~ola/ap/recurrence.html

http://stackoverflow.com/questions/13467674/determining-complexity-for-recursive-functions-big-o-notation

Tutorial

https://www.topcoder.com/community/data-science/data-science-tutorials/

Lintcode 总结

https://lefttree.gitbooks.io/leetcode/content/intro.html

小土刀

http://wdxtub.com/interview/14520609088903.html

Top 10 Algorithms for Coding Interview

http://www.programcreek.com/2012/11/top-10-algorithms-for-coding-interview/

我的面试题总结

http://www.mitbbs.co.nz/article_t/JobHunting/32564237.html

Jan 16 Steve

变量名尽可能详细，不要缩写

java 不需要查null，但需要查empty

method的名字都是动词

test phases: setup, test, verify

常量设定成变量，给名字，e.x.: DEFAULT_PRICE

test 写在一个test class里而不是main