花花酱 LeetCode 67. Add Binary

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

The input strings are both non-empty and contains only characters 1 or 0.

Example 1:

Input: a = "11", b = "1"
Output: "100"

Example 2:

Input: a = "1010", b = "1011"
Output: "10101"

Solution: Big integer

Time complexity: O(n)
Space complexity: O(n)

C++

// Author: Huahua

class Solution {

public:

string addBinary(string a, string b) {

int carry = 0;

int i = a.length() - 1;

int j = b.length() - 1;

string ans;

while (i >= 0 || j >= 0) {

int s = (i >= 0 ? a[i--] - '0' : 0) +

(j >= 0 ? b[j--] - '0' : 0) +

carry;

carry = s >> 1;

ans += '0' + (s & 1);

}

if (carry) ans += '1';

return {rbegin(ans), rend(ans)};

}

};

请尊重作者的劳动成果，转载请注明出处！花花保留对文章／视频的所有权利。
如果您喜欢这篇文章／视频，欢迎您捐赠花花。
If you like my articles / videos, donations are welcome.

Buy anything from Amazon to support our website
您可以通过在亚马逊上购物（任意商品）来支持我们

Paypal

Venmo
huahualeetcode

微信打赏