0Add Binary

Given two binary strings a and b, return 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 <= 10⁴
a and b consist only of '0' or '1' characters.
Each string does not contain leading zeros except for the zero itself.

 class Solution:
    def addBinary(self, a: str, b: str) -> str:

        b1 = int(a, 2)
        b2 = int(b, 2)

        r = b1+b2
        return bin(r)[2:]

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