LeetCode067 Add Binary

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"

最简单的想法就是用python自带函数将二进制字符串转为十进制数字，相加后再返回二进制。

把二进制字符串转为十进制有很多方法，这个比较常用。int(str,2)

class Solution(object):
    def addBinary(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        numa = int(a,2)
        numb = int(b,2)        
        return bin(numa+numb)[2:]