Solutions to the yearly Advent of Code challenges in Java, 2015-2023 (ongoing).
To provide puzzle input, place your input as a text file with the name day(num).txt in the corresponding folder in ./advent/input (for example, 2017 day 21 should look like ./advent/input/2017/day21.txt) Alternatively, find your session cookie, and place the alphanumeric value in a file named token.txt in ./advent/input for automatic downloading of input!
All work is original with the exception of a few common helper datatypes, and almost all solutions are optimized to run in under 1 second.
