Solving Advent of Code 2021, with a goal of solving problems fast, but without heavy preparation.
Reusing some utility code in C# from previous years.
Most days solved in C#, some in Google Sheets. Google Sheets solutions at: https://docs.google.com/spreadsheets/d/1wk87NUsil-nxoGAnPpQ4hOv8L3-fKv9rVmTuX0r6Hi0/edit#gid=0