ruby 1/solution.rb
ruby 1/solution_part_2.rb
ruby 2/solution.rb
ruby 2/solution_part_2.rb
ruby 3/solution.rb
ruby 3/solution_part_2.rb
ruby 4/solution.rb
ruby 4/solution_part_2.rb|grep -i northpole
ruby 5/solution.rb
ruby 5/solution_part_2.rb
ruby 6/solution.rb # both
ruby 7/solution.rb # both
ruby 8/solution.rb # both
ruby 9/solution_part_1.rb
ruby 9/solution_part_2.rb
ruby 10/solution.rb # both