Day 14: Parabolic Reflector Dish

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[-] sjmulder@lemmy.sdf.org 4 points 2 years ago

C

Chose not to do transposing/flipping or fancy indexing so it's rather verbose, but it's also clear and (I think) fast. I also tried to limit the number of search steps by keeping two cursors in the current row/col, rather than shooting a ray every time.

Part 2 immediately reminded me of that Tetris puzzle from day 22 last year so I knew how to find and apply the solution. State hashes are stored in an array and (inefficiently) scanned until a loop is found.

One direction of the shift function:

for (x=0; x

this post was submitted on 14 Dec 2023

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