Java 7

public static String stringsXOR(String s, String t) {
        StringBuffer res = new StringBuffer();
        for(int i = 0; i < s.length(); i++) {
            if(s.charAt(i) == t.charAt(i))
                res.append("0");
            else
                res.append("1");
        }

        return res.toString().trim();
    }

Solution for python:

def strings_xor(s, t):
    res = ""
    for i in range(len(s)):
        if s[i] == t[i]:
            res += '0';
        else:
            res += '1';

    return res

s = input()
t = input()
print(strings_xor(s, t))

Solution for python:

def strings_xor(s, t): res = "" for i in range(len(s)): if s[i] == t[i]: res += '0'; else: res += '1';

return res

This problem does not work for C++. The test sample will fail, even though the output for your answer and correct answer are the same.

It will work correctly if you switch the language to Python3. It's the same edits as C++

This problem worked for me in Python3. The idea is there and you are not going insane, problem does not compile correctly for most options.