Leet code: - 1071 "Greatest Common Divisor of Strings"

solve with recursion:

Time Complexity: O(n)

Space Complexity: O(n)

Solution Link: - https://leetcode.com/problems/greatest-common-divisor-of-strings/solutions/5655486/using-recursion/


Code: -

    class Solution {

    public String gcdOfStrings(String str1, String str2) {
        if(str2.length() > str1.length()){
            return gcdOfStrings(str2,str1);
        }else if(str1.equals(str2)){
            return str1;
        }else if(str1.startsWith(str2)){
            return gcdOfStrings(str1.substring(str2.length()),str2);
        }
        return "";
    }
}

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