advent Of Code 2015

Series of small programming puzzles.

http://adventofcode.com/

To run the command:

    $ ruby xxxx.rb

For some puzzles, you can pass parameter "2" to run the second part of the puzzle:

    $ ruby xxxx.rb 2

I was always wondering:

• Should I write a minimum line of codes (at a cost to lose readability)?
• Should I trust the input? For example, will the input file contains only "<>^v"?
• Should I create functions or objects? Will the code be used another time?