## Paint adjacent boundaries with distinct colors

Did you know that the minimum number of colors needed for this to work is 4?

adjacencybacktrackingac-3colorsPython## Square each element of a Scala list

There are two practical ways to square each element of a list.

pattern matchingmapScala## Summation with rationals

Using Scala and the powers of Recursion.

functional programmingrecursionScala## Heroku login on a proxy (Windows 7)

Making Heroku easier one step at a time.

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