Best Cow Line (POJ 3617)

best_cow_line.rb

## Best Cow Line (POJ 3617)
## http://rubyfiddle.com/riddles/f878f

s = "ACDBCB"
n = s.length #文字の長さ。"ACDBCB"の場合は6。
t = ""
i=0

loop do
  break if s.size == 1
  case s[0..i] <=> s[s.size-1-i..s.size-1]
    when 1
    t += s.slice!(s.size-1-i..s.size-1).reverse
    i=0
    when -1
    t += s.slice!(0..i)
    i=0
    when 0
    i += 1
  end
end

puts t+s