These are written when I was practicing on the
Online Judge System.
Since many teachers use this system for homework, I do not share my source
code online anymore. Instead I put the list of problems that I
have given answers. Please don't ask me for the source code of your homework.
However, I am still open to share algorithms for solving the problem
with those interested in mutual discussions.
Feel free to contact me: "htlin" at "csie.ntu.edu.tw"