advent of code 2019, done whenever i can be bothered
As with my 2020 one, my code will assume that the input from the site (https://adventofcode.com/2019) is stored in the same directory as my code as n.txt for day n.
19 jan 2021: 1a to 3a 20 jan 2021: 3b to 4b 27 jan 2021: 5a to 5b