# Greatest Common Divisor of Strings

Category

Array / String

Checkbox

Checkbox

Difficulty

Easy

Index

2

Key Ideas

The key idea to solve this problem is to find the greatest common divisor (GCD) of the two given strings and return it.

Problem Number

1071

Problem Summary

The problem "Greatest Common Divisor of Strings" (Problem Number: 1071) is an easy-level problem in the Array/String category on LeetCode. It involves finding the greatest common divisor of two strings. A key pitfall in this problem is understanding the concept of greatest common divisor and correctly implementing the algorithm to find it. Additionally, handling edge cases where the strings do not have a common divisor or where one string is a substring of the other is important to consider.

Solution Summary

To solve the problem "Greatest Common Divisor of Strings" from LeetCode's curated list, the best solution involves finding the greatest common divisor (GCD) of the lengths of the two input strings. First, we check if the concatenated strings of str1 and str2 are equal to the concatenated strings of str2 and str1. If they are not equal, then there is no common divisor. If they are equal, we return the substring of str1 from index 0 to the length of the GCD. This solution has a time complexity of O(n), where n is the length of the input strings, and it effectively determines the greatest common divisor of the strings.

Tags

Math

String