Project-Euler / 11
Problem 11 asks:
What is the greatest product of four adjacent numbers in any direction (up, down, left, right, or diagonally) in the 20×20 grid?
I was going to solve this in Java but ended up just using my eyes (with a little help from Vim).
![Searching [98]\d in Vim with 'hlsearch' set on.](http://i.imgur.com/cKXOd.png "Searching [98]\d in Vim with 'hlsearch' set on.")