LeetCode 67. Add Binary

Description

https://leetcode.com/problems/add-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.

Explanation

Convert to decimal integer and do summing. Then convert back to binary string.

Python Solution

class Solution:
    def addBinary(self, a: str, b: str) -> str:
        return bin(int(a, 2) + int(b, 2))[2:]
  • Time Complexity: O(1).
  • Space Complexity: O(1).

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