Day 2 Notes
------
Part1:
------
$ elixir day2part1.exs
414
Thoughts:
Use a regex to parse the input
Huh, can't iterate a string with Enum. Split into a list with String.graphemes/1
------
Part2:
------
$ elixir day2part2.exs
413
Thoughts:
Convert indices to be zero-based.
No xor operator without importing Bitwise? Just write it manually.
Initially misread the problem - thought first position must match, and second position must not match,
which caused some confusion.
Probably rebound to the same variable names a bit too much - should work on clearer variable names.
After reading the elixir forum thread, String.at would have been fine for Part 2.
https://elixirforum.com/t/advent-of-code-2020-day-2
Also feel pretty dumb that I didn't realise bool != bool is effectively xor
