[LeetCode] Longest Consecutive Sequence 求最長連續序列
Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. ...
原文：[LeetCode 128] - 最長連續序列(Longest Consecutive Sequence)
問題 給出一個未排序的整數數組，找出最長的連續元素序列的長度。 如： 給出 , , , , , ， 最長的連續元素序列是 , , , 。返回它的長度： 。 你的算法必須有O n 的時間復雜度。 初始思路 要找連續的元素，第一反應一般是先把數組排序。但悲劇的是題目中明確要求了O n 的時間復雜度，要做一次排序，是不能達到的。不過我們還是先來看看排序的方案要怎么實現。 簡單來說，排序后我們只要遍歷數組 ...
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