Day 18: Simplify animate by removing history
Day 18: Simplify animate by removing history

I'd implemented history expecting that the second part
of the puzzle would involve re-running the animations,
but it doesn't help because the grid is different in
the second part.

robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions