part2

Advent of Code 2022 - Day 14 Part 2

How many units of sand come to rest? (now there's a floor)

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; add two, and then add "floor" to blocks, using @x_tolerance
• raise if we run out of width (need up the @x_tolerance)
• add to new sands MapSet as well as blocks
• add full?/1 which simply checks for the three below source to be there
• call itself until full
• return MapSet.size(sands)

Running

mix run

Testing

mix test