[LeetCode]67 二进制相加
Add Binary(二进制相加)【难度:Easy】 Given two binary strings, return their sum (also a binary string).For example, a = “11” b = “1” Return “100”.给定两个二进制数的字符串,以字符串形式返回他们的和。 如: a = “11” b = “1” return “10