xinyu04

摘要： You may recall that an array arr is a mountain array if and only if: arr.length >= 3 There exists some index i (0-indexed) with 0 < i < arr.length - 1 阅读全文

摘要： 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 th 阅读全文