1. leetcode
2. careerup
http://hawstein.com/posts/ctci-solutions-contents.html
3. glassdoor
http://www.glassdoor.com/index.htm
4. topcoder
5. zoj
http://acm.zju.edu.cn/onlinejudge/
6. july的博客
http://blog.csdn.net/v_july_v/article/details/6543438
7. mitbbs
http://www.mitbbs.com/bbsdoc/JobHunting.html
8. poj
9. 杭电acm
10. codeforces