Advent of Code 2023 Day 21 - Python walkthrough

EDIT: https://www.youtube.com/watch?v=yVJ-J5Nkios for a better explanation https://github.com/Anshuman-UCSB/Advent-Of-Code I'm so sorry. I used NP to fit a polynomial to the data to automate it all, but sweet lord it's ugly. Part 1 0:00 Part 2 5:07