Web Reference: In-depth solution and explanation for LeetCode 459. Repeated Substring Pattern in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Jul 12, 2025 · We can check if the string is a repetition of a substring by slicing and reconstructing the string using multiplication. We concatenate the string with itself to allow rotation-based checks. We remove the first and last characters of the concatenated string. Nov 18, 2016 · Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You may assume the given string consists of lowercase English letters only and its length will not exceed 10000.
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