2020 Day 23 retrospective

[jp7677]

There has to be a proper way to solve part 2. The current implementation is just a brute force attempt which needs several hours. It works, but certainly not how it is supposed to be solved.
Currently the test is skipped (https://github.com/jp7677/adventofcode/blob/main/src/day23.cpp#L59).

[jp7677]

See #10 after unfortunately reading an half a sentence hint how to approach this without needing a 4 hours test run :(.