[2024][ruby][11.x] refactoring

1 month ago · c05de086e0
parent 96d6e705ce
commit c05de086e0
1 changed files with 3 additions and 2 deletions
--- a/2024/ruby/day_11.rb
+++ b/2024/ruby/day_11.rb
@ -6,14 +6,15 @@ blink = Hash.new {|h, k|
           1
         elsif n.zero?
           h[[1, times-1]]
-         elsif (s = n.to_s.size) && s.even?
-           a, b = [n.to_s[0...s/2], n.to_s[s/2..]].map(&:to_i)
+         elsif n.digits.length.even?
+           a, b = n.divmod(10**(d.length/2))
           h[[a, times-1]] + h[[b, times-1]]
         else
           h[[n*2024, times-1]]
         end
 }

+pp stones.sum { blink[[_1, 6]] }
 pp stones.sum { blink[[_1, 25]] }
 pp stones.sum { blink[[_1, 75]] }