The graphic above has been created with AoCTiles/create_aoc_tiles.py script. Feel free to use it in your own repositories. See the AoCTiles/README.md for instructions on how to use it.

All solutions expect the input via stdin and print to stdout. Each solution always prints part 1 and 2 at the same time on separate lines. In order to test the programs you can pipi the input to the program: julia 1.jl < input.in, which is then compared to input.ans. Instead of doing this manually, I use my program-tester.sh script (see here), which runs the given program on all *.in files in the directory, and tests whether the corresponding *.ans file matches the given output. I have mapped that program on Enter in vim, which makes testing programs easy. To validate a program manually, type diff <(julia 1.jl < input.in) input.ans.

Programs are initialized with the init-day.sh script. I.e. typing init-day.sh 10 initializes the 10th day by creating a folder named 10, downloading the input test case with the session.cookie, copying the dummy.py file and opening the solution file.

• 2021: There is a solution for each problem in Julia. Sometimes there is a Python or APL solution as well. I'm trying out Julia for the first time, mostly focusing on short and elegant code.