Add Binary - leetcode

spkang

于 2013-10-03 13:55:41 发布

阅读量789

点赞数

CC 4.0 BY-SA版权

分类专栏： job leetcode 文章标签： leetcode

本文链接：https://blog.youkuaiyun.com/spkang/article/details/12253471

job 同时被 2 个专栏收录

15 篇文章

订阅专栏

leetcode

13 篇文章

订阅专栏

本文详细解释了如何将两个二进制字符串相加并返回结果字符串的方法，通过模拟加法运算来实现二进制加法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Add Binary

My Submissions

Given two binary strings, return their sum (also a binary string).

For example,
a = "11"
b = "1"
Return "100".

思路：模拟加法

class Solution {
public:
    string addBinary(string a, string b) {
        // Note: The Solution object is instantiated only once and is reused by each test case.
        if (a.length() < b.length()) {
            a.swap(b);
        }
        a.insert(a.begin(), '0');
        int i = a.length()-1;
        int j = b.length()-1;
        while (i > 0) {
            if (a.at(i) - '0' > 1) {
                a.at(i - 1) = a.at(i-1)  + ((a.at(i) - '0') >> 1);
                a.at(i) = (a.at(i) - '0') % 2 + '0';
            }
            if (j >= 0) {
                int t = (a.at(i) - '0') + (b.at(j) - '0');
                a.at(i) = t%2 + '0';
                a.at(i-1) = a.at(i-1) + (t >> 1);
            }
            --i;
            --j;
        }
        if (a.at(0) == '0')
            return string (a.begin() + 1, a.end());
        return a;
    }
};