Python Solution for 2021 Advent of Code - Day 14 - Part 2 - Extended Polymerization

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Solution to only part two of 2021's Advent of Code's Day 14's problem. You might have different data to deal with. However, hopefully the code still works the same for you as it does for me.

Bradley Sward is currently an Associate Professor at the College of DuPage in suburban Chicago, Illinois. He has earned a Masters degree in Software Engineering from DePaul University, a Masters degree in Computer Science from the University of Illinois at Springfield, and two Bachelors degrees in Computer Science and Molecular Biology from Benedictine University. Prior to teaching, Bradley worked for five years in the field of casino gaming on a variety of video slot machine and poker games. The Village People have been permanently etched into his brain.
  1. Bradley Sward
  2. Advent Of Code
  3. Advent
  4. AoC
  5. 2021
  6. Day 14
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The odd 1 is from the last letter of the base polymer, which is only part of 1 expansion. I calculated the answer by grouping counts by the first letter of the pair (with the last letter as a dummy pair).

alistairwall