message: Add another solution for 'Number complement' problem
diff: @@ -32,3 +32,10 @@ class Solution2(object):
  while i <= num:
  i <<= 1
  return (i - 1) ^ num
  +
  +
  +class Solution3(object):
  + def findComplement(self, num):
  + bits = '{0:b}'.format(num)
  + complement_bits = ''.join('1' if bit == '0' else '0' for bit in bits)
  + return int(complement_bits, 2)
  