decompress_run_length_encoded.rb

# @param {Integer[]} nums
# @return {Integer[]}
def decompress_rl_elist(nums)
    result = []
    for index in (0..nums.size-2) do
      item = nums[index]
      if index.even?
        item.times do
          result << nums[index+1]  
        end 
      end
    end    
    result
end