标签:style blog class code c tar
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Given two binary strings, return their sum (also a binary string).
For example,
a = "11"
b = "1"
Return "100"
.
题意:给定两个二进制字符串,返回它们的和
思路:
1.按最长的循环,短的前面补零
2.因为变量少,不用考虑节省空间,定义为int最行了
3.用二进制可能会快一点。不过实现会麻烦一些
复杂度:时间O(m+n),空间O(m+n)
class Solution { public: string addBinary(string a, string b){ string result; int carry = 0; int scale = 2; for(int i = a.size() - 1, j = b.size() - 1; i >= 0 || j >= 0; i--,j--){ int ai = i > -1 ? a[i] - ‘0‘ : 0; int bi = j > -1 ? b[j] - ‘0‘ : 0; int residual = (ai + bi + carry) % scale; carry = (ai + bi + carry) / scale; result.insert(result.begin(), residual + ‘0‘); } if(carry) result.insert(result.begin(), carry + ‘0‘); return result; } };
Leetcode 数 Add Binary,布布扣,bubuko.com
标签:style blog class code c tar
原文地址:http://blog.csdn.net/zhengsenlie/article/details/25872615