Web Reference: Repeated Substring Pattern - Given a string s, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. 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. The key to solving this problem is to see clearly that if s can be obtained by repeating the substring, then the starting letter of the substring must be s[0]. Once you understand this, the scope of substring investigation is greatly narrowed.
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