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Category: Expert

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Dynamic Programming — Highway Billboard Problem

Objec­tive:  Sup­pose you’re man­ag­ing con­struc­tion of bill­boards on the Rocky & Bull­win­kle Memo­r­ial High­way, a heav­ily trav­eled stretch of road that runs west-east for M miles. The pos­si­ble sites for bill­boards are given by…

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Dynamic Programming — Longest Palindromic Subsequence

Objec­tive: Given a string, find a longest palin­dromic sub­se­quence in it. What is Longest Palin­dromic Sub­se­quence: A longest palin­dromic sub­se­quence is a sequence that appears in the same rel­a­tive order, but not nec­es­sar­ily contiguous(not substring)…

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The Word Break Problem

Objec­tive : Given an string and a dic­tio­nary of words, find out if the input string can be bro­ken into a space-separated sequence of one or more dic­tio­nary words. Exam­ple: dic­tio­nary = [“I” , “have”,…

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Construct Binary Search Tree from a given Preorder Traversal Using Stack (Without Recursion)

Objec­tive: — Given a pre­order tra­ver­sal, con­struct BST from that, with­out using recur­sion. Input: Pre­order tra­ver­sal Sim­i­lar Prob­lem : This prob­lem is sim­i­lar to the Con­struct Binary Search Tree from a given Pre­order Traversal…