求一个未排序数组中，出现的长度最长的连续子序列长度。
Given an unsorted array of integers, find the length of the longest consecutive elements sequence.
题意在线性的时间内找到集合中元素组成的最长的连续序列。
Given an unsorted array of integers, find the length of the longest consecutive elements sequence.
题意在线性的时间内找到集合中元素组成的最长的连续序列。
Given an unsorted array of integers, find the length of the longest consecutive elements sequence.
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