new_contents: """Leetcode 67. Add Binary
  Easy
  
  URL: https://leetcode.com/problems/add-binary/
  
  Given two binary strings, return their sum (also a binary string).
  
  The input strings are both non-empty and contains only characters 1 or 0.
  
  Example 1:
  Input: a = "11", b = "1"
  Output: "100"
  
  Example 2:
  Input: a = "1010", b = "1011"
  Output: "10101"
  """
  
  class Solution(object):
      def addBinary(self, a, b):
          """
          :type a: str
          :type b: str
          :rtype: str
          """
          pass
  
  
  def main():
      a = "11"
      b = "1"
      # Output: "100"
      print Solution().addBinary(a, b)
  
      a = "1010"
      b = "1011"
      # Output: "10101"
      print Solution().addBinary(a, b)
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc067_add_binary.py