Leetcode67二进制求和

1104

代码：

class Solution {
    public String addBinary(String a, String b) {
        StringBuffer ans = new StringBuffer();
        int n = Math.max(a.length(),b.length()),carry = 0;
        for(int i=0;i0){
            ans.append('1');
        }
        return ans.reverse().toString();
    }
}