給定兩個二位元字串，回傳兩個二位元總和並以二位元字串表示。
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.
2020-02-17
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給定兩個二位元字串，回傳兩個二位元總和並以二位元字串表示。
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.