Solutions for the Advent of Code 2019 in Kotlin.
Sources are in src/, input files are in res/.
Main is in AoC.kt. Running it without parameters prompts for a day and input file. These can also be supplied as command-line arguments.
For the input, the corresponding files input{day} or input{day}Test located in res/ can be used. If no file is specified it will attempt to open the file for the specified day.