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。

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Given an unsorted array of integers, find the length of the longest consecutive elements sequence.

求一个未排序数组中，出现的长度最长的连续子序列长度。

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Map elements are used to convert the data format between different structures, for example, whenever the data formats between consecutive elements are incompatible.

映射元素用来在不同的结构之间转换数据格式，例如，无论什么时候，在连续的元素之间数据格式都是不相容的。

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