#!/usr/bin/env ruby

require 'trollop'


def usage
  STDERR.write "./sample --size <n> --population <n>\n"
  exit 1
end
usage if ARGV.size!=4

opts = Trollop::options do
  opt :size, "Sample size (percentage).", :type => :int
  opt :population, "'Population' (number \in N)", :type => :int
end


prng = Random.new(Random.new_seed)

1.upto(opts[:population]) { |i|
  puts i if prng.rand(1..opts[:size])==0
}