Create 1071-greatest-common-divisor-of-strings.cpp

Author: Vicen-te

Diff for: cpp/1071-greatest-common-divisor-of-strings.cpp

@@ -0,0 +1,47 @@
+/**
+ *  Time Complexity: O(n^2) 
+ *  Space Complexity: O(1)
+ */
+
+class Solution {
+public:
+    string gcdOfStrings(string str1, string str2) {
+        string shortest, longest;
+        
+        if(str1.length() < str2.length()){
+            shortest = str1;
+            longest = str2;
+        }
+        else{
+            shortest = str2;
+            longest = str1;
+        }
+
+        string solution = "";   
+        ushort shortest_length = shortest.length();
+        ushort longest_length = longest.length();
+
+        for(ushort i = shortest_length; i > 0; --i)
+        {   
+            if (longest_length % i != 0 || shortest_length % i != 0) continue;
+
+            for(ushort j = 0; j < longest_length; ++j)
+            {
+                ushort first_pointer = j % i;
+                ushort second_pointer = j % shortest_length;
+
+                if(shortest[first_pointer] != longest[j] || shortest[second_pointer] != longest[j])
+                {
+                    solution = "";
+                    break;
+                }
+
+                if(first_pointer == j) solution += longest[j];
+            }
+            
+            if(solution != "") return solution;
+        }
+
+        return "";
+    }
+};