Leaving aside day 20 for a bit, let's look at day 21 Allergen Assessment. We must gather provisions for a journey by raft to our destination. The problem? The ingredient list on the foods is in an unknown language. The allergen information is in...
Okay, after a bit of a delay... I got very stuck on Day 19, but couldn't let it go. I kept having great ideas for improving the solution to part 2, but couldn't get it to run fast enough to find the solution. After talking to a friend I finally s...
Today's puzzle Operation Order is a simple arithmetic problem. The homework (your puzzle input) consists of a series of expressions that consist of addition (+), multiplication (*), and parentheses ((...)). Just like normal math, parentheses indic...
Time to do some catchup. As I mentioned in my earlier post the Day 17 puzzle Conway Cubes is superficially similar to Day 11 Seating System which I wrote about here. The pocket dimension contains an infinite 3-dimensional grid. At every integer 3-...
It's been a hard week to find time for AOC -- my grandma was diagnosed with Covid, my freelance work is picking up and... Christmas shopping. So I'm going to have to skip day 17 for now. Day 17 seems to be a 3D version of day 11 -- with an unknown...
Today I’m going to talk about how to get started on these problems and how I think through the steps. Day 16: Ticket Translation looks a bit challenging, but doesn’t seem to involve any math tricks, etc., so it's straight-forward programming. Oka...
In today's puzzle "Rambunctious Recitation" we check in with our elf friends at the North Pole and learn about the game they're playing: In this game, the players take turns saying numbers. They begin by taking turns reading from a list of starting ...
Today's puzzle was pretty straightforward. We're working with a bitmask: The initialization program (your puzzle input) can either update the bitmask or write a value to memory. Values and memory addresses are both 36-bit unsigned integers. For exa...
Day 13 starts out easy enough. We made it to an island (not our destination) and now need to take a bus to the local airport. The problem states: Bus schedules are defined based on a timestamp that measures the number of minutes since some fixed ...
