Advent of Code

These are my solutions to http://adventofcode.com

All solutions are written in Haskell.

Input

In general, all solutions can be invoked in both of the following ways:

• Without command-line arguments, takes input on standard input.
• With 1+ command-line arguments, reads input from the first, which must be the path to an input file. Arguments beyond the first are ignored.

Some may additionally support other ways:

Day 25 (Combo Breaker): Can also pass the public keys on ARGV

Closing thoughts

You learn some cool tricks by being around other Haskellers.

Pairs:

[(x, y) | x:ys <- tails xs, y <- ys]

Repeated permutations:

replicateM 3 [0, -1, 1]