Day 1: Sonar Sweep
Haskell: Part 1 (00:05:22, rank 3082), Part 2 (00:09:03, rank 2071)
Quite an easy opener for day 1. I started writing a recursive solution before realising zip was more appropriate to the task. I'm probably a little bit rusty, and also running on about 4 hours of sleep. I fell asleep around 10:30pm, woke up at 2:30am and gave up trying to get back to sleep at 4am, opting instead to prepare for the first coding puzzle by watching videos of someone repairing cars...
As usual, a nontrivial amount of time was also taken up by reading the problem text. For some reason I always feel compelled to go through it slowly, where a lot of experienced puzzlers just seem to hone in on the important details and jump straight to work. That's probably a useful skill to work on... I can always come back and read the flavour text later.
Going from part 1 to part 2 was very trivial since it just required the use of zipWith3 with the tail and the tailtail of the input list to sum over the sliding windows. Definitely the kind of situation that is well suited to Haskell.