My solutions for 2021 Advent of Code solutions. No special assumptions this year just make solutions as simple as possible. Changed my mind. No mutations besides parsing. Zero mutable variables. Pure functional Rust. Everything would be done in rust. It would prob kill me, but why not ;)

Mutable borrows are allowed unless I actually need to create mutable variables (so implementing own iterator, or functions like Iterator::scan are ok).

Current code stats would be generated with tokei.

  ~/git/aoc2021 main ?2
 tokei
===============================================================================
 Language            Files        Lines         Code     Comments       Blanks
===============================================================================
 Cabal                   1           55           46            3            6
 Haskell                 2           59           34            7           18
 Markdown                1           29            0           26            3
 TOML                   15          126           84           14           28
 YAML                    2          111           36           64           11
-------------------------------------------------------------------------------
 Rust                   14         1330         1111           16          203
 |- Markdown             2           12            0            9            3
 (Total)                           1342         1111           25          206
===============================================================================
 Total                  35         1710         1311          130          269
===============================================================================