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…

Given an array of integers and an integer k, return true if and only if there are two distinct indices i and j in the array such that nums[i] = nums[j] and the difference between i and j is at most k. (Old Version) Given an array of integers and an i…

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…

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. 这道题不算难题,就是使用一个哈希表,遍历整个数组,如果哈希表里存在,返回fal…

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 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…

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 / /…

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. +----+------------------+ | Id | Email | +----+------------------+ | 1 | john@example.com | | 2 | bob@example.com |…

给定一个整数数组,判断数组中是否有两个不同的索引 i 和 j,使 nums [i] 和 nums [j] 的绝对差值最大为 t,并且 i 和 j 之间的绝对差值最大为 k. 详见:https://leetcode.com/problems/contains-duplicate-iii/description/ Java实现: TreeSet数据结构(Java)使用红黑树实现,是平衡二叉树的一种.该数据结构支持如下操作:floor()方法返set中≤给定元素的最大元素:如果不存在这样的元素,则返回…

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 an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once. For example: Given nums = [1, 2, 1, 3, 2, 5], return [3, 5]. Note: The order…

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. SOL1: public class Solution { public b…

Implement a MyCalendarThree class to store your events. A new event can always be added. Your class will have one method, book(int start, int end). Formally, this represents a booking on the half open interval [start, end), the range of real numbers …

Description: 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. 题目大意:给定一个数组,和两个数t和k.判断是否满…

题意: 如果所给序列的元素不是唯一的,则返回true,否则false. 思路: 哈希map解决. class Solution { public: bool containsDuplicate(vector<int>& nums) { unordered_map<int,int> mapp; ; i<nums.size(); i++) { if(mapp[nums[i]]) return true; ; } return false; } }; AC代码 python…

给定一个整数数组,判断数组中是否有两个不同的索引 i 和 j,使得 nums [i] 和 nums [j] 的差的绝对值最大为 t,并且 i 和 j 之间的差的绝对值最大为 ķ. 示例 1: 输入: nums = [1,2,3,1], k = 3, t = 0 输出: true 示例 2: 输入: nums = [1,0,1,1], k = 1, t = 2 输出: true 示例 3: 输入: nums = [1,5,9,1,5,9], k = 2, t = 3 输出: false 方法一:暴…

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…

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. 题目标签:Array, Hash Table 题目给了我们一个nums array 和一个 k, 让…

The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each house has one and only one parent house. After a tour, the smart thief realized that "all hou…

Contains Duplicate 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. 解题思路 用一个set保存数组中的值,假…

要插入的数据  与表中记录数据的 惟一索引或主键中产生重复值,那么就会发生旧行的更新 弊端:造成主键自增不连续.适合数据量不大的表. ON DUPLICATE KEY UPDATE后面的条件 eg有如下表,仅主键存在UK(唯一)属性: select * from Student id name age 1 jack 20 2 rose 21 insert into Student ( id,name) values (1,'jack') ON DUPLICATE KEY UPDATE name…

Contains Duplicate III 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. 关于上述题意,我们可以转化为两…

217. Contains Duplicate 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. 判断数组是是否含有重复元素.…

mysql当插入重复时更新的方法: 第一种方法: 示例一:插入多条记录 假设有一个主键为 client_id 的 clients 表,可以使用下面的语句: INSERT INTO clients (client_id,client_name,client_type) SELECT supplier_id,supplier_name,'advertising' FROM suppliers WHERE not exists(select * from clients where clients.c…

mysql当插入重复时更新的方法: 第一种方法: 示例一:插入多条记录 假设有一个主键为 client_id 的 clients 表,可以使用下面的语句: INSERT INTO clients (client_id,client_name,client_type) SELECT supplier_id,supplier_name,'advertising' FROM suppliers WHERE not exists(select * from clients where clients.c…

说明:一般我们使用MYSQL插入记录时,类似于这样的语句: insert into table_name(email,phone,user_id) values(‘test9@163.com’,’99999′,’9999′) , 但是有时候我们可能还有这样的需求:判断数据是否存在, 如果不存在,则插入,.如果存在,则更新(或者不做任何操作). 方案一:REPLACE语法 replace的语法格式为: 1. replace into table_name(col_name, …) values(……

Spire.Doc提供了Table.applyVerticalMerge()方法来垂直合并word文档里面的表格单元格,Table.applyHorizontalMerge()方法来水平合并表格单元格.默认情况下,如果要合并的单元格包含相同的值,那么合并后的单元格会有重复的值. [程序环境] 本次测试时,在程序中引入Spire.Doc for Java.可通过以下方法引用Spire.Doc.jar文件: 方法1:将Spire.Doc for Java下载到本地,解压,安装.安装完成后,找到安装路…

1 innodb 自增列出现重复值的问题 先从问题入手,重现下这个bug use test; drop table t1; create table t1(id int auto_increment, a int, primary key (id)) engine=innodb; ,);); ); select * from t1; +----+------+ | id | a | +----+------+ | | | +----+------+ ; ; select * from t1; +…

200 ? "200px" : this.width)!important;} --> 介绍 本篇文章主要介绍在插入数据到表中遇到键重复避免插入重复值的处理方法,主要涉及到IGNORE,ON DUPLICATE KEY UPDATE,REPLACE:接下来就分别看看这三种方式的处理办法. IGNORE 使用ignore当插入的值遇到主键(PRIMARY KEY)或者唯一键(UNIQUE KEY)重复时自动忽略重复的记录行,不影响后面的记录行的插入, 创建测试表 CREATE TA…

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…