#!/usr/bin/env ruby

fname = ARGV[0]
data = {}
data.default = 0

File.open(fname) { |file|
  file.each_line { |line|
    val = line.chomp.to_i
    data[val] += 1
  }
}

# puts data.sort_by { |k, v| v }.map { |k, v| "#{k} -> #{v}"}

# NOTE: (a[1] - b[1]) or (a[0] - b[0]) does not work because 0 is true in ruby.

# Sorting: DESC by count, ASC by value
puts data
  .sort { |a, b| a[1] != b[1] ? b[1] - a[1] : a[0] - b[0] }
  .map { |k, v| "#{k} -> #{v}"}