LeetCode-128：Longest Consecutive Sequence
題目 給出一個未排序的數組，找出最長的連續序列，連續指的是像……十一、十二、1三、14……這樣的，要求算法時間複雜度爲O(n)。 作一些說明：不知道會不會有重複的數字，若是有應該怎麼算？看最後AC的狀況，應該是若是有重複的數字，不算在序列裏邊。 思路 一、本身的思路 我剛開始是想用hash結構來處理，不過又以爲hash好像時間複雜度也挺高，不知道誰給個人hash時間複雜度搞得感受，是上上hash查
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