Longest distance between identical numbers in a list ignoring identical numbers in between

distance.rb

# Longest distance between identical numbers in a list ignoring identical numbers in between
# e.g. input number of numbers 5, then each number followed by a return
# use gets.chomp to get console input
n = gets.chomp.to_i
h = Hash.new

(1..n).each do |i|
  n = gets.chomp.to_i
  if h[n]
    h[n] << i
  else
    h[n] = [i]
  end
end

count = 0
max_distance = 0

p h

# Could check in the loop here using a boolean if
# there were any array length > 1 to save looping
# twice with the.any? call
h.each do |key, array|
  if array.length > 1
    count += array.combination(2).to_a.length
    dist = array.max - array.min
    max_distance = dist if dist > max_distance
  end
end

if h.values.any? {|arr| arr.length > 1}
  puts count
  puts "distance: #{max_distance}"
else
  p "NA"
end