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LeetCode--Longest Consecutive Sequence(最长连续序列) Python

运维开发网 https://www.qedev.com 2020-07-07 16:41 出处:网络 作者:运维开发网整理
题目描述:   Longest Consecutive Sequence(最长连续序列)   中文: 给定一个未排序的整数数组,找出最长连续序列的长度。

题目描述:

  Longest Consecutive Sequence(最长连续序列)

 

中文:

给定一个未排序的整数数组,找出最长连续序列的长度。

要求算法的时间复杂度为 O(n)

 

英文:

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

Your algorithm should run in O(n) complexity.

class Solution(object):
    def longestConsecutive(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        Dict = {}
        for i in nums:
            Dict[i] = 1   
        List = Dict.keys()       
        count_max = 0   
        while(len(Dict)):
            List = Dict.keys()
            count = 1
            temp_left = List[0]
            temp_right = List[0]
            Dict.pop(temp_left)
            while(1):
                if temp_left-1 in Dict and temp_right+1 in Dict:
                    count = count+2
                    temp_left = temp_left-1
                    temp_right = temp_right+1
                    Dict.pop(temp_left)
                    Dict.pop(temp_right)
                    continue
                elif temp_left-1 not in Dict and temp_right+1 in Dict:
                    count = count+1
                    temp_right = temp_right+1
                    Dict.pop(temp_right)
                    continue
                elif temp_left-1 in Dict and temp_right+1 not in Dict:
                    count = count+1
                    temp_left = temp_left-1
                    Dict.pop(temp_left)
                    continue
                else:
                    if count>count_max:
                        count_max=count
                        break
                    else:
                        break
        return count_max

 

 

题目来源:力扣

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