CodeIQ vol.2

binaries = [
  0b1111110, # 0
  0b0110000, # 1
  0b1101101, # 2
  0b1111001, # 3
  0b0110011, # 4
  0b1011011, # 5
  0b1011111, # 6
  0b1110000, # 7
  0b1111111, # 8
  0b1111011, # 9
]

max_count = 1000
max_array = []

st = Time.now

binaries.permutation(10).to_a.each do |bit_array|
  count = 0

  0.upto(8) do |i|
    b1, b2 = bit_array[i..i + 1]
    count += (b1 ^ b2).to_s(2).count('1')
    break if count > max_count
  end

  if count < max_count
    max_count = count
    max_array = bit_array
  end
end

et = Time.now

p max_array.map{|bit_array| binaries.index(bit_array) }
p max_count
puts "#{et - st}(sec)"