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Manacher's Algorithm Javascript . Instead use a set (if you can use ecmascript 6) or store the strings as a key in an object (this however requires counting the keys at the end which can be a bit bothersome unless you can use object.keys() which in. Create a string q of length 2 ⋅ n + 1, by inserting any letter that doesn't appear in the input string (call it special character for the purpose of this article), in the spaces between any 2 characters. 8 Tips to help you better optimize your JavaScript algorithms from morioh.com Assume the given string s has a length of n, s = a b a b a b a . For (int i = 1; Manacher algorithm uses palindrom's property that it is symmetric around center.