Advent of Code — 2020

Submission System

Challenge Highlights

  1. Day 19 — Monster Messages:
    This challenge (seen here ) was about rule matching. I have considered several approaches but they were taking too long time to do.
    Instead I remembered that one can create a set of rules and write a yacc file. Essentially, lex and yacc can be used to create and compile a grammar which has certain set of rules. See here
    What this meant for me was that I did not had to bother with writing recursive programs, come up with optimized approaches. All I had to do is to input the rules and see how many input strings would match.
    This was a huge time saver. See the code here:

Final Word

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