摘要：
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:** `` 阅读全文
摘要：
You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. The digits are ordered fro 阅读全文