18+ jeff, 5 months ago

I spent a few extra mins debugging the infinite loop that occurred when light bounced and split properly but entered a cycle w/o hitting an edge.

I added a second 'visited' hash to track position & heading, and avoided cycles.

I made a simple Beam class so I could clone it on the splitters and set opposing headings.

Part 2 was just an array of border starts, offsets, and headings.

There was probably a faster way, but it ended up readable and fast enough.

18+ velkuns, 5 months ago

@jeff why rotating the heading vector and not just set it, like for splitting part ?

Probably most generic, but less simpler in this case 😁

And again, we have a very similar approach today. I also tend to use more the queue over recursion when possible, thanks to previous AoC years 👍

18+ jeff, 5 months ago

@velkuns So all of my 2d library's features feel equally loved. 😁

Yeah, I feel like I start with DFS on everything by default now.

I like your const map approach. 👍

18+ velkuns, 5 months ago

@jeff Make sense for love 😁

SI started with if { if {} } then switch to map array for readability.