67-add-binary

DevGod

Vtuber

Caution

DevGod needs to write an editorial for this problem!

java

class Solution {
    public String addBinary(String a, String b) {
        StringBuilder sb = new StringBuilder();
        int carry = 0;
        int i = a.length() - 1;
        int j = b.length() - 1;

        while (i >= 0 || j >= 0 || carry == 1)
        {
            if(i >= 0){
                carry += a.charAt(i--) - '0';
            }
            if(j >= 0){
                carry += b.charAt(j--) - '0';
            }
            sb.append(carry % 2);
            carry /= 2;
        }
        return sb.reverse().toString();
    }
}