thing.rb

require 'socket'

s = TCPSocket.new("104.131.107.153", 12121)
p s.gets
second_line = false
last_line = []
point = 0
s.each_line do |line|

  puts line
  if line =~ /(-?[0-9]+) \+ (-?[0-9]+)$/
    p $1, $2
    p ($1.to_i + $2.to_i).to_s
    s.write(($1.to_i + $2.to_i).to_s)
  elsif line =~ /(-?[0-9]+)x \+ (-?[0-9]+)y = (-?[0-9]+)$/
    p $1, $2, $3
    if second_line
      second_line = false
      x = ((last_line[2].to_f/last_line[1].to_f) - ($3.to_f/$2.to_f)).fdiv((last_line[0].to_f/last_line[1].to_f) - ($1.to_f/$2.to_f)).round
      p x.to_s
      p ($3.to_i - ($1.to_i * x)).fdiv($2.to_i).round.to_s
      s.write(x.to_s)
      s.write(($3.to_i - ($1.to_i * x)).fdiv($2.to_i).round.to_s)
      last_line = []
    else
      second_line = true
      last_line[0] = $1
      last_line[1] = $2
      last_line[2] = $3
    end
  elsif line =~ /at point (-?[0-9]+):$/
    p $1
    point = $1.to_i
  elsif line =~ /f\(x\) = (.*)$/
    p $1
    result = 0
    $1.split(" + ").each do |expression|
      p expression
      if expression =~ /([0-9])x\^([0-9])$/
        p $1, $2
        p (($2.to_i * $1.to_i) * (point ** ($2.to_i - 1))).to_s
        result += (($2.to_i * $1.to_i) * (point ** ($2.to_i - 1)))
      elsif expression =~ /([0-9])x$/
        p $1
        p $1
        result += $1.to_i
      elsif expression =~ /([0-9])$/
        p $1
        p 0.to_i
        result += 0
      end
    end
    p result.to_s
    s.write(result.to_s)
    point = 0
  end

end