问题描述: 给定两个字符串,求解这两个字符串的最长公共子序列(LongestCommon Sequence)。比如字符串1:BDCABA;字符串2:ABCBDAB则这两个字符串的最长公共子序列长度为4,最长公共子序列是:BCBA 问题分析: 使用递归的基础之上,进行了相应的剪枝操作,避免重复计算。 代码实现: ...
LeetCode上的最长连续序列问题有哪些解法? Question : 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 ...
LeetCode—128.最长连续序列和[Longest Consecutive Sequence]——分析及代码[C++] 一、题目 二、分析及代码 1. 哈希表 (1)思路 (2)代码 (3)结果 三、其他 一、题目 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: 来源:力扣(LeetCode) 链接:http...leet...
Binary Tree Longest Consecutive Sequence 参考资料: https://leetcode.com/problems/longest-consecutive-sequence/ https://leetcode.com/problems/longest-consecutive-sequence/discuss/41055/my-really-simple-java-on-solution-accepted https://leetcode.com/problems/longest-consecutive-sequence/discuss/41060/a-sim...
力扣.128 最长连续序列 longest-consecutive-sequence 力扣.1 两数之和 N 种解法 two-sum 力扣.167 两数之和 II two-sum-ii 力扣.170 两数之和 III two-sum-iii 力扣.653 两数之和 IV two-sum-IV 力扣.015 三数之和 three-sum 题目 给定一个未排序的整数数组 nums ,找出数字连续的最长序列(不要求...
LeetCode-Longest Consecutive Sequence 哎,这题又不会做,想了好久,还是想不出来,最长连续的数的长度,首先想到的肯定是排序,O(nlogn),不过题目要求是O(n), 于是又想到用hash的思想,类似数组记数的方式,不过即便不考虑存的空间的话,因为给定的数的大小并不在一定的范围之内,...
LeetCode128. Longest Consecutive Sequence 记不得曾经 Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. You must write an algorithm that runs in O(n) time. Example 1: [1, 2, 3, 4] Example 2: Input: nums = [0,3,7,2,5,8,4...
Longest Consecutive Sequence@LeetCode Longest Consecutive Sequence 本题直观的解法就是排序之后遍历,但是题目要求只用O(n)的复杂度,那么先排序显然是无法满足要求的。 那么这种『显然要遍历所有元素,但是却只给了O(n)的复杂度』,这样就想到了HashMap。把数组中的每个元素都放入一个HashMap中为key,value为boolean...
leetcode -- Longest Consecutive Sequence -- 重点 https://leetcode.com/problems/longest-consecutive-sequence/ 思路很简单。 http://chaoren.is-programmer.com/posts/42924.html code class Solution(object): def longestConsecutive(self, num): """...
[LeetCode]Longest Consecutive Sequence 题目大意 给定一个整形数组,求出最长的连续序列。例如数组[100,4,200,1,3,2],最长的连续序列长度为[1,2,3,4],长度为4。要求时间复杂度为O(n)。 思路 "排序转换成经典的动态规划问题"的话排序至少需要时间复杂度为O(nlog(n))——pass...