- Solutions for problems in geeksforgeeks.
- Solutions for problems in LeetCode.
- Solutions for problems in HackerRank.
- Solutions for problems in TopCoder.
- Solutions for poblems in SPOJ.
- Solutions for problems in mitbbs.
- Solutions for problems in LightOJ.
- Solutions for problems in CodeForces
- Solutions for problems in hihoCoder
The Java implements for design patterns.
- News-feed: How to build a News Feed such as Facebook's news feed?
To Be Continued...