[leetcode]Longest Consecutive Sequence
最近经常闲的无聊,于是就做做leetcode的题了,目测好像都不是很难. 不过呢,闲的无聊还是记录下某些做了的题. Given an unsorted array of integers, find the length of the longest consecutive ...
原文：[LeetCode]Longest Consecutive Sequence
题目大意 给定一个整形数组，求出最长的连续序列。例如数组 , , , , , ，最长的连续序列长度为 , , , ，长度为 。要求时间复杂度为O n 。 思路 排序转换成经典的动态规划问题 的话排序至少需要时间复杂度为O nlog n pass 利用c 中的set，直接会排序，并且没有重合的，但是set背后实现的原理牵扯到红黑树，时间复杂度不满足 pass 建立hash索引，把查找的元素周围的都 ...
2014-04-19 22:54 0 4063 推荐指数：
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