require 'minitest'
require 'minitest/autorun'

class Solution
  def self.run(items, jumps = 0)
    return jumps if items.nil? || items.empty?

    run(items[items[1..items[0]].max..-1], jumps+1)
  end
end


class SolutionTest < MiniTest::Test
  def test_simple_example
    # 3 -> 5 -> 4
    assert_equal Solution.run([3, 2, 5, 1, 1, 9, 3, 4]), 2
  end
end