Hacker Rank Solutions: Missing Numbers

Hacker Rank Solutions: Missing Numbers

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list_1_length = $stdin.gets.to_i

list1 = $stdin.gets.chomp.split(' ')

list_2_length = $stdin.gets.to_i

list2 = $stdin.gets.chomp.split(' ')

list1hash = {}
list2hash = {}

times = list_1_length > list_2_length ? list_1_length : list_2_length

times.times do |i|
  if list1[i] != nil
    n = list1[i]
    if list1hash[n] == nil
      list1hash[n] = 1
    else
      list1hash[n] += 1
    end
  end

  if list2[i] != nil
    n = list2[i]
    if list2hash[n] == nil
      list2hash[n] = 1
    else
      list2hash[n] += 1
    end

  end
end

if list1hash.length > list2hash.length
  biggest = list1hash
  smallest = list2hash
else
  smallest = list1hash
  biggest = list2hash
end

arr = []
biggest.each do |k, v|
  arr << k.to_i if smallest[k] != v
end

puts arr.sort.join(' ')

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