LeetCode 67 二進制求和

LeetCode 67 二進制求和

class Solution {
    public String addBinary(String a, String b) {
        

        //二進制求和

        StringBuffer sba = new StringBuffer(a);
        StringBuffer sbb = new StringBuffer(b);
        sba = sba.reverse();
        sbb = sbb.reverse();

        StringBuffer ans = new StringBuffer("");
        int t = 0;

        for(int i = 0;i < sba.length() || i < sbb.length();i ++){
            if(i < sba.length()) t += sba.charAt(i) - '0';
            if(i < sbb.length()) t += sbb.charAt(i) - '0';

            ans.append(t%2);
            t/=2;
        }

        if(t!=0) ans.append(t);
        return ans.reverse().toString();
    }
}