solver for 零は？ https://qiita.com/shiracamus/items/3d3ec5d95c8384ccf424

reiwa.rb

#!/usr/bin/ruby
#
# reiwa.rb - solver for 零は？ https://qiita.com/shiracamus/items/3d3ec5d95c8384ccf424
#
require 'socket'
require 'pp'

s = TCPSocket.new("zerois-o-reiwa.seccon.jp", 23615)

count = 0

loop do
  line = ""
  loop do
    c = s.read(1)
    break if c == "\n"
    line << c
  end
  pp line
  if line[0] == "0"
    count += 1
    if line.include?("?*0")
      s.puts "0"
    elsif count == 99 or count == 100
      s.puts "0"
    else
      line = line.gsub(/\?/, "x")
      e = "bash -c 'echo \"solve([#{line}], [x]);\" | maxima'"
      rv =`#{e}`
      rv.each_line do |l|
        if l.include?("[")
          l.chomp!
          ans = l.gsub(/\[(.+)\]/, "\\1").split(" ")
          pp ans
          a = ans[4]
          pp a
          s.puts(a)
          #s.write("\n")
          break
        end
      end
    end
  end
end