2103_rings_and_rods.rb

# frozen_string_literal: true

# https://leetcode.com/problems/rings-and-rods/
# @param {String} rings
# @return {Integer}
def count_points(rings)
  rods = {}
  rings.chars.each_slice(2) do |c, r|
    rods[r] ||= []
    rods[r] << c
  end

  rods.values.count { |arr| arr.uniq.sort == %w[B G R] }
end