https://leetcode.cn/problems/add-binary/ 给你两个二进制字符串 a 和 b ,以二进制字符串的形式返回它们的和。 示例 1: 输入:a = "11", b = "1" 输出:"100" 示例 2: 输入:a = "1010", b = "1011" 输出:"10101" 提示: 1 <= a.length, b.length <= 104 a 和 b 仅由字符 '0' 或 '1' 组成 字符串如果不是 "0" ,就不含前导零
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