### longest arithmetic subsequence

Given an array of integers A, devise an algorithm to find the longest arithmetic progression in it. Here we will try to find Longest Increasing Subsequence length, from a set of integers. permutation. Level: MediumAsked In: Amazon, Facebook, Microsoft Understanding the Problem. Facebook Interview Dynamic Programming. 0. thumb_up 4. (Modified from Your task is to construct any permutation of first \(n\) positive integers such that the length of the longest arithmetic subsequence of the permutation is equal to \(k\) or determine that there is no such permutation at all. 2.4 Based on 30 vote(s) Please write to us at contribute@geeksforgeeks.org to report any issue with the … Longest Arithmetic Subsequence of Given Difference. a[j] is in the AP of a[i] from index i to j. C++ / 4 lines / hash map. LCS. Eg: {1,3,5}, {1,2,3} are arithmetic subsequence of sequence {1,2,3,4,5} with length 3. how to construct any permutation of first N positive integers such that the length of the longest arithmetic subsequence of the permutation is equal to K. Copy link Quote reply Contributor pawarhrishi21 commented Sep 25, 2020. Iterating the array, and record the intermediate answers in a hash map - this requires O(N) time and O(N) space. 0. For all j, greater than some i(

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