LeetCode 1071: Greatest Common Divisor of Strings | Python Solution Explained Step-by-Step

In this Python coding tutorial, we’ll solve LeetCode Problem 1071: Greatest Common Divisor of Strings. This problem is classified as Easy but can be tricky if you don’t understand the key concept of string division. We’ll walk you through the logic of determining the largest string that divides both str1 and str2 by using a clever mathematical approach.

What You’ll Learn:
How to find the Greatest Common Divisor (GCD) of two strings using Python.
Why checking str1 + str2 == str2 + str1 is essential for identifying a common divisor.
Step-by-step explanation of solving GCD with fractions library.
Best practices for string manipulation and edge cases when solving similar coding interview questions.
Example Problems Covered:
Example 1:

Input: str1 = "ABCABC", str2 = "ABC"
Output: "ABC"
Example 2:

Input: str1 = "ABABAB", str2 = "ABAB"
Output: "AB"
Example 3:

Input: str1 = "LEET", str2 = "CODE"
Output: "" (No common divisor string)
By the end of this video, you’ll have a clear understanding of how to solve LeetCode 1071 using Python, improving your skills for future coding interviews. Watch the video to see a step-by-step breakdown and apply this concept to other string problems.

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