problem

​​1071. Greatest Common Divisor of Strings​​

solution

class Solution {
public:
    string gcdOfStrings(string str1, string str2) {
        return (str1+str2==str2+str1) ? 
            (str1.substr(0, gcd(str1.size(), str2.size()))) : "";
    }
};

参考

1. ​​Leetcode_easy_1071. Greatest Common Divisor of Strings​​;

完