最长连续序列 给定一个未排序的整数数组,找出最长连续序列的长度. 说明 要求你的算法复杂度为O(n) 样例 给出数组[100, 4, 200, 1, 3, 2],这个最长的连续序列是 [1, 2, 3, 4],返回所求长度 4 解题 排序后比较简单,快排O(nlogn) 后面只需要O(n)的时间复杂度求解了 发现原数组里面有重复数字的时候,下面方法行不通了. public class Solution { /** * @param nums: A list of integers * @retu…

Given a k-ary tree, find the length of the longest consecutive sequence path. The path could be start and end at any node in the tree ExampleAn example of test data: k-ary tree 5<6<7<>,5<>,8<>>,4<3<>,5<>,3<>…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1] are both considered valid, but the path [1,2,4,3] is not v…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [100, 4, 200, 1, 3, 2], The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4. Your algorithm should run i…

Given a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1] are both considered valid, but the path [1,2,4,3] is not v…

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. Example: Input: [100, 4, 200, 1, 3, 2] Output: 4 Explanation: The longest consecutive elements sequence i…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

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). 示例: 输入: [100, 4, 200, 1, 3, 2] 输出: 4 解释: 最长连续序列是 [1, 2, 3, 4].它的长度为 4. 如果不要求算法的时间复杂度为 O(n),排序后遍历即可.沒想出怎么解,看了思路后AC如下,主要是用到Hash映射 public class LongestConsecutiveSequence { public int longestConsecutive(int[]…