Solution: Greatest Common Divisor of Strings
Explore how to determine the greatest common divisor of two strings by checking string concatenations and computing the GCD of their lengths. This lesson helps you understand and implement an efficient solution that identifies the largest repeating pattern shared between strings, preparing you to solve similar math-based coding interview challenges confidently.
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Statement
For two strings s and t, we say that t divides s if and only if s can be formed by concatenating one or more copies of t together (i.e., s = t + t + ... + t).
Given two strings str1 and str2, return the largest string x such that x divides both str1 and str2. If no such string exists, return an empty string.
Constraints:
str1.length,str2.lengthstr1andstr2consist of English uppercase letters. ...