[leetcode]Longest Consecutive Sequence
最近經常閑的無聊,於是就做做leetcode的題了,目測好像都不是很難. 不過呢,閑的無聊還是記錄下某些做了的題. Given an unsorted array of integers, find the length of the longest consecutive ...
原文：[LeetCode]Longest Consecutive Sequence
題目大意 給定一個整形數組，求出最長的連續序列。例如數組 , , , , , ，最長的連續序列長度為 , , , ，長度為 。要求時間復雜度為O n 。 思路 排序轉換成經典的動態規划問題 的話排序至少需要時間復雜度為O nlog n pass 利用c 中的set，直接會排序，並且沒有重合的，但是set背后實現的原理牽扯到紅黑樹，時間復雜度不滿足 pass 建立hash索引，把查找的元素周圍的都 ...
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