【实际例子】: int[] nums = {4,1,3,2}, int resultExpected = 4 1publicclassSolution {2publicintlongestConsecutive(int[] nums) {3intresult = 0;4Map<Integer, Bound> rangeMap =newHashMap<Integer, Bound>();56for(inti = 0; i < nums.length; i++) {7intnum =nums[i];8if( !rangeMa...
题目: Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. E
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 is [1, 2, 3, 4]. Therefore its le...
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 in O(n) complexity. 思路: 因为要不...
The longest consecutive elements sequence is[1, 2, 3, 4]. Return its length:4. Your algorithm should run in O(n) complexity. 思路 求乱序数组中最长的可连续数字(位置不一定相邻)。 用hash存下数组的所有值。然后第二次遍历,对于每个数,从后往前每次加一检查是否存在于hash表中,存在则计数加一继续;...
就是一个左右不断合并的过程。然后不断把已经探明过的值从HashSet中删除以避免重复探测。 参考网址: http://www.programcreek.com/2013/01/leetcode-longest-consecutive-sequence-java/ 然后还有一种 Union Find 的做法。 我看了网上对该算法的解释和Discuss里面的代码后自己重写了一个, ...
给你一个未排序的数组,返回最长连续数字串的长度,这个数字串可以不连续存储。 二. 思路 代码: class Solution { public int longestConsecutive(int[] nums) { //step1: 把所有数字加到set里 Set<Integer> num_set = new HashSet<Integer>(); for (int num : nums) { num_set.add(num); } int res...
Java Solution 2 We can also project the arrays to a new array with length to be the largest element in the array. Then iterate over the array and get the longest consecutive sequence. If the largest number is very large, then the time complexity would be bad. ...
128. Longest Consecutive Sequence 题目描述(困难难度) 给一个数组,求出连续的数字最多有多少个,时间复杂度要求是O(n)。 解法一 首先想一下最直接的暴力破解。我们可以用一个HashSet把给的数组保存起来。然后再考虑数组的每个数,比如这个数是n,然后看n + 1在不在HashSet中,然后再看n + 2在不在,接下来n...
Given an unsorted array of integersnums, return the length of the longest consecutive elements sequence. You must write an algorithm that runs inO(n)time. Example 1: Input: nums = [100,4,200,1,3,2]Output: 4Explanation: The longest consecutive elements sequence is[1, 2, 3, 4]. Therefo...