package leetcode.string;

/**

* @ClassName AddBinary

* @Description 二进制求和 https://leetcode-cn.com/problems/add-binary/

* @Author changxuan

* @Date 2020/11/21 下午11:31

**/

public class AddBinary {

public String addBinary(String a, String b) {

StringBuilder ans = new StringBuilder();

int ca = 0;

for(int i = a.length() - 1, j = b.length() - 1;i >= 0 || j >= 0; i--, j--) {

int sum = ca;

sum += i >= 0 ? a.charAt(i) - '0' : 0;

sum += j >= 0 ? b.charAt(j) - '0' : 0;

ans.append(sum % 2);

ca = sum / 2;

}

ans.append(ca == 1 ? ca : "");

return ans.reverse().toString();

}

}