Add Binary
Easy
Given two binary strings a and b, provide their sum as a binary string.
Example 1
Input: a = "11", b = "1"
Output: "100"
Example 2
Input: a = "1010", b = "1011"
Output: "10101"
Constraints
1 <= a.length, b.length <= 10^4aandbconsist only of'0'or'1'characters.- Each string does not contain leading zeros except for the zero itself.
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