Leetcode | 67. Add Binary | Java | C#

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Leetcode | 67. Add Binary | Java | C#

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"
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