part1

Advent of Code 2022 - Day 14 Part 1

How many units of sand come to rest before sand starts flowing into the abyss below?

Setup

• split by newline
• reduce to MapSet of rocks, via for comprehensions
• Enum.chunk_every/4 comes in very handy

Implementation

• first, compute the max depth; anything beyond is :infinity
• use the iterative function is drop_sand/3 which increments a unit counter each time it is called
• call itself until the next sand unit falls off (returns :infinity)

Running

mix run

Testing

mix test