67. Add Binary

Easy

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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.

Accepted

802,834

Submissions

1,598,514

class Solution:
    def addBinary(self, a: str, b: str) -> str:
        i,j,summ,carry=len(a)-1,len(b)-1,"",0
        while i>=0 or j>=0 or carry:
            d1=int(a[i]) if i>=0 else 0
            d2=int(b[j]) if j>=0 else 0
            summ+=str((d1+d2+carry)%2)
            carry=(d1+d2+carry)//2
            i,j=i-1,j-1
            #print(summ)
        return summ[::-1]
            
            

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