61A - Ultra-Fast Mathematician

#include <cmath>#include <cstdio>#include <cstdlib>#include <cstring>#include <iostream>#include <string>#include <vector>#include <queue>#include <algorithm>using namespace std;int main() {    string s1;    string s2;    cin >> s1 >> s2;    int len = s1.length();    for(int i = 0; i < len; ++i) {        int x = s1[i] - '0';        int y = s2[i] - '0';        cout << (x^y);    }    cout << endl;    return 0;}