For the 10th Day of Advent of Code, we're asked to solve a matching braces problem. This is a common parser exercise, but it's made a bit more complex in this case by using multiple types of braces. Specifically, we're handling a series of lines that contain
), but also
The story jazzes it up as being the code of our submarine's navigational computer, which consists entirely of braces in a sort of eldritch horror version of brainfuck, but that's mostly just a distraction.