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package com.yangchd.leetcode.easy;

/**

* @author yangchd 2018/10/24

*

* 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"

*

*/

public class AddBinary {

class Solution {

public String addBinary(String a, String b) {

StringBuilder sb = new StringBuilder();

int m = a.length() - 1;

int n = b.length() - 1;

int carry = 0;

while (m >= 0 || n >= 0) {

int sum = carry;

if (m >= 0) {

sum += a.charAt(m--) - '0';

}

if (n >= 0) {

sum += b.charAt(n--) - '0';

}

sb.append(sum % 2);

carry = sum / 2;

}

if (carry != 0) {

sb.append(carry);

}

return sb.reverse().toString();

}

}

}