Ah! Thanks for making my notice the GCM -> GCD typo. I'm not gunning for the leaderboards myself, it's pretty hopeless ^^. Yes i am assuming based off of experience and utility tools.

I myself have tools to automatically get the inputs, and submit outputs, but that's more because it pleases me than to actually be fast: https://github.com/zogwarg/advent-of-code/blob/main/functions.sh

(Also completely pointlessly have a functions to extract the session cookie from chrome storage from the CLI, despite being long-lived, and therefore much simpler to simply copy-paste from debugger window)