核心思想是:序列化树 序列化后,用String可以唯一的代表一棵树,其实就是前序遍历改造一下(空节点用符号表示): 一边序列化,一边用哈希表记录有没有重复的,如果有就添加,注意不能重复添加. 重点就是序列化树,序列化得到的String可以唯一的代表一棵树,这个思想很多题都用到了 并不是只是前序遍历就能唯一表示一棵树,加上结构信息就可以了. Map<String,TreeNode> map = new HashMap<>(); List<TreeNode> res = n…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any oneof them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

[LeetCode]652. Find Duplicate Subtrees 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/find-duplicate-subtrees/description/ 题目描述: Given a binary tree, return all duplicate sub…

Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolute difference between i and j is at most k. Example 1: Input: nums = [1,2,3,1], k = 3 Output:…

Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between nums[i] and nums[j] is at most t and the absolute difference between i and j is at most k. Example 1: Input: nu…

［抄题］: 就是出现了多次的子树,可以只包括一个点. Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node value…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. 题目标签:Array, Hash Table 题目给了我们一个nums arr…

每天一算:Contains Duplicate II 描述 给出1个整形数组nums和1个整数k,是否存在索引i和j,使得nums[i] == nums[j] 且i和j之间的差不超过k Example 1: Input: nums = [1,2,3,1], k = 3 Output: true. Example 2: Input: nums = [1,0,1,1], k = 1 Output: true Example 3: Input: nums = [1,2,3,1,2,3], k = 2…

题目标签: 题目给了我们一个 email 的表格,让我们删除重复的. 建立Person p1,Person p2,当email 相同时,而且 p1 id 要大于 p2 id 时候,删除这一行. Java Solution: Runtime:  869 ms, faster than 33 % Memory Usage: N/A 完成日期:06/01/2019 关键点:p1.Id > p2.Id # Write your MySQL query statement below DELETE p1…

题意: 有一个含有n+1个元素的数组,元素值是在1-n之间的整数,请找出其中出现超过1次的数.(保证仅有1个出现次数是超过1的数) 思路: 方法一:O(nlogn).根据鸽笼原理及题意,每次如果<=k的数超过了k个,那么答案必定在[1,k].可以用二分枚举答案来解决. bool left(vector<int>& nums,int tar)//是否在左边 { ; ; i<nums.size(); i++) if(nums[i]<=tar) cnt++; return…

/** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: unordered_map<string, vector<TreeNode*>> s; ve…

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct. Example 1: Input: [1,2,3,1] Output: tru…

LeetCode 652: 寻找重复的子树 Find Duplicate Subtrees 题目: 给定一棵二叉树,返回所有重复的子树.对于同一类的重复子树,你只需要返回其中任意一棵的根结点即可. 两棵树重复是指它们具有相同的结构以及相同的结点值. Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root nod…

Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, find the duplicate one. Note: You must not modify th…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

寻找重复的子树 给定一棵二叉树,返回所有重复的子树.对于同一类的重复子树,你只需要返回其中任意一棵的根结点即可. 两棵树重复是指它们具有相同的结构以及相同的结点值. 下面是两个重复的子树: 因此,你需要以列表的形式返回上述重复子树的根结点. 思路 Intuition We can serialize each subtree. For example, the tree 1 / \ 2 3 / \ 4 5 can be represented as the serialization 1,2,#…

Given an array of integers, find out whether there are two distinct indices i and j in the array such that the difference between nums[i] and nums[j] is at most t and the difference between i and j is at most k. 这道题跟之前两道Contains Duplicate 包含重复值和Conta…

Question Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 /…

题目标签: 题目给了我们一个 email 的table,让我们找到重复的 email. 可以建立 Person a, Person b, 找到两个表格中,emai 相等 但是 id 不同的 email, 然后利用DISTINCT 返回,因为两个表格中,会找到两个 重复的email. Java Solution: Runtime:  224 ms, faster than 40 % Memory Usage: N/A 完成日期:06/01/2019 关键点:用DISTINCT # Write yo…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

10.6 You have 10 billion URLs. How do you detect the duplicate documents? In this case, assume that "duplicate" means that the URLs are identical. 这道题让我们在一百亿个URL链接中寻找相同项,看这数据量简直吓尿了,如果每个URL链接平均100个字符的话,每个字符是4个字节,那么总共需要占4TB的空间,我们无法在内存中导入这么大的数据量.假如…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any oneof them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

前言: 每道题附带动态示意图,提供java.python两种语言答案,力求提供leetcode最优解. 描述: 找到给定字符串(由小写字符组成)中的最长子串 T , 要求 T 中的每一字符出现次数都不少于 k .输出 T 的长度. 示例 1: 输入:s = "aaabb", k = 3 输出:3 最长子串为 "aaa" ,其中 'a' 重复了 3 次. 示例 2: 输入:s = "ababbc", k = 2 输出:5 最长子串为 "a…

这是两个非常常见的SSAS处理异常,网上也能找到很多文章讲解决办法,但很少见关于异常原因的分析,先来看看第一个" OLAP 存储引擎中存在错误: 处理时找到重复的属性键",一个维度表的关键字段,也就是通常讲的主键,是必须具有唯一性的,如果因为维度主键字段出现重复键,真没什么好说的了,太不应该犯这种错误,所以通常大家看到这个处理异常信息都是因为一个非主键属性,例如[Dim Customer]维度里的[Education]属性,和主键[Customer Key]是一对多的关系,Educat…

xcode引入第三方静态类库 duplicate symbol _OBJC_XXX 重复编译错误 一:场景 xcode 同时引入了 libA.a, libB.a 两个静态类库,如果 这两个静态类库之中,都打包了,相同的库,方法之类的, 且 xcode 的 other link flag 为 -all_load 时,就会出现 上述 静态类库,重复编译错误: 二:解决方法 1:把xcode 的 other link flag 里面的 -all_load 去掉:有 force-load 的也去掉: 2…

http://docs.huihoo.com/oracle/crm-on-demand/21/local/html/Release21_SimpleChinese/index.htm?toc.htm?aboutrecordduplicateshelp.html 关于重复记录和外部 ID 在导入记录时,可以选择采用以下方法处理重复记录: 不导入重复记录 覆盖现有记录 注意: 在导入“任务”.“预约”和“附注”时无法使用此覆盖选项.将始终为这些记录类型创建新记录. 为重复项创建附加记录(仅限于“联系…

EasyUI datagrid 删除的时候无法正确找到重复记录row index的问题: 如果无法正确找到重复记录的row index,就需要进行注意添加的时候所进行的 操作:如果添加的时候就是添加的同一个js对象,在查找的时候就会出现找不到 正确的index的问题,解决方式是在添加重复对象的时候首先进行对象克隆:…

本内容是LeetCode第三道题目:无重复字符的最大子串 # -*- coding: utf-8 -*- """ Created on Sun Mar 10 20:14:53 2019 @author: Administrator Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb"…

LeetCode:删除排序数组中的重复项||[80] 题目描述 给定一个排序数组,你需要在原地删除重复出现的元素,使得每个元素最多出现两次,返回移除后数组的新长度. 不要使用额外的数组空间,你必须在原地修改输入数组并在使用 O(1) 额外空间的条件下完成. 示例 1: 给定 nums = [1,1,1,2,2,3], 函数应返回新长度 length = 5, 并且原数组的前五个元素被修改为 1, 1, 2, 2, 3 . 你不需要考虑数组中超出新长度后面的元素. 示例 2: 给定 nums =…