{ solve = input_file: let data = builtins.readFile input_file; lines = builtins.filter (s: s != "" && builtins.isString s) (builtins.split "\n" data); # Basic maths because the standard library doesn't have it mod = a: b: a - (a / b) * b; abs = n: if n < 0 then -n else n; recurse = list: position: score1: score2: let first = builtins.head list; # This is not guaranteed to work but it's good enough num_part = builtins.substring 1 999 first; num = builtins.fromJSON num_part; delta = mod (if (builtins.substring 0 1 first) == "R" then num else -num) 100; next = mod (position + delta + 100) 100; score = if next == 0 then 1 else 0; circles = num / 100; passed = if position == 0 then 0 else if delta < 0 && delta + position <= 0 || delta > 0 && delta + position >= 100 then 1 else 0; in if list == [] then [score1 score2] else recurse (builtins.tail list) next (score + score1) (score2 + passed + circles); in recurse lines 50 0 0; }