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easy Shortest Palindrome medium Longest Palindromic Substring hard Kmp Pattern Searching hard Z Algorithm For Pattern Searching hard Find String Roots hard Manacher's Algorithm hard String Rotation hard Prefix And Suffix Count medium Say No To Palindrome medium String Polynomial Hashing medium Diane medium Rabin Karp Pattern Find (spoj) medium Good Substrings hard Longest Duplicate Substring medium Longest Prefix Suffix hard Lexicographical Suffixes