leetcode.1027 Longest Arithmetic Sequence 最长等差数列 给定一个整数数组A,返回A中最长等差子序列的长度。 回想一下,A的子序列是列表A[i_1], A[i_2], ..., A[i_k]其中0 <= i_1 < i_2 < ... < i_k <= A.length - 1。并且如果B[i+1] - B[i](0 <= i < B.length - 1) 的值...
LeetCode 1027. Longest Arithmetic Sequence dp问题,一维是没法dp的,因为我们还要记录一个diff才能判断是否是Arithmetic Sequence。 dp[i][diff] 表示以 A[i] 结尾,等差为 diff 的最大长度。从这种角度来看本题和LeetCode 300. Longest Increasing Subsequence / 354. Russian Doll Envelopes极为相似。 classSolutio...
Input: arr = [1,3,5,7], difference = 1 Output: 1 Explanation: The longest arithmetic subsequence is any single element. Example 3: Input: arr = [1,5,7,8,5,3,4,2,1], difference = -2 Output: 4 Explanation: The longest arithmetic subsequence is [7,5,3,1]. 来源:力扣(LeetCode...
Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that the difference between adjacent elements in the subsequence equals difference. Example 1: Input: arr = [1,2,3,4], difference = 1 Output: 4 Ex...
Space Complexity: O(n*m) This solution usesHashMapto store substrings. A similar problem uses same idea to store difference between two numbers. 1027. Longest Arithmetic Sequence
【LeetCode】1218. Longest Arithmetic Subsequence of Given Difference,Givenanintegerarrayarr andanintegerdifference,returnthelengthofthelongestsubsequenceinarr whichisanarithmeticsequencesuchthatthedifferencebetweenadjacentelementsinthesub
【leetcode】1027. Longest Arithmetic Sequence 题目如下: Given an arrayAof integers, return the length of the longest arithmetic subsequence inA. Recall that asubsequenceofAis a listA[i_1], A[i_2], ..., A[i_k]with0 <= i_1 < i_2 < ... < i_k <= A.length - 1, and that a...
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https://github.com/grandyang/leetcode/issues/1218 参考资料: https://leetcode.com/problems/longest-arithmetic-subsequence-of-given-difference/ https://leetcode.com/problems/longest-arithmetic-subsequence-of-given-difference/discuss/398196/C%2B%2B-O(n)-DP-using-Hashmap ...
[LeetCode] 1027. Longest Arithmetic Subsequence Given an arraynumsof integers, returnthe length of the longest arithmetic subsequence innums. Notethat: Asubsequenceis an array that can be derived from another array by deleting some or no elements without changing the order of the remaining ...