def query(n) puts n.join('') STDOUT.flush end def reply x, y = gets.split x = x.to_i exit 0 if 'unlocked' == y x end def detect_counts counts = Array.new(10) 0.upto(9) do |i| query [i] * 10 counts[i] = [i, reply] end counts end def detect_answer(counts) min_i, min_c = counts.sort_by{|i, c| c }.first numbers = counts.select{|i, c| 0 < c } - [[min_i, min_c]] answer = Array.new(10) numbers.each do |i, c| 10.times do |j| next if answer[j] q = Array.new(10){ min_i } q[j] = i query q n = reply next if n <= min_c answer[j] = i end end answer.map.with_index.select{|i, idx| i.nil? }.each do |i, idx| answer[idx] = min_i end query answer end detect_answer(detect_counts)