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Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode040. Combination Sum II (Medium)links：Title: https://leetcode.com/problems/combination-sum-ii/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：With 391 samples (given a set of positive integers, and a target number, select some number from the set to make them equal to the number of targets), but cannot select the number of duplicates.Ana

The "real-time communication" described in this article is mainly about browsing the real-time communication between the S-side and the server-side. Analysis of large and medium-sized web site technical architecture one series.Real-time communication is divided into 3 major categories:1. Pull technology, polling (Polling)The client periodically polls the request and the server returns immediately. Advantages: Short link, convenient server pro

Virtualbox error: "Fatal: NoBootable medium found !" Using virtualbox to install the system has a very high chance of this error, because when brother encounters the same problem, he crashes "Fatal: No bootable medium found! "A lot of content appears Most of the above problems are caused by using ghost to install the system in virtualbox. You can enter a PE system in a virtual machine. This is written into

Title: hdoj 3605 escape Category: medium maximum stream | bipartite graph multi-match Question: N people and M planets are given. Everyone is interested in what they want, and each planet has a capacity. Can anyone live on the planet they want? Analysis: if the maximum stream is used, the card is very strict. After this topic is written, the MTL is handwritten, the memory is exceeded, and then the status is compressed, and then the Tel cannot be vi

Guidance:In the image collection process, the instability of electronic devices (such as glitch voltage and electromagnetic interference) may affect the obtained images. This effect is called noise, noise reduction technology is a technology used to eliminate such noise impact in image processing. Two-dimensional median filtering is one of the methods.Median Filter is a local image smoothing technique. It is a non-linear filter. It can be a one-dimensional or two-dimensional image, because the i

DoS (Denial of Service) is a network attack that uses a reasonable amount of service resources to prevent legal users from receiving service responses. DoS attacks may occur in the following ways:* The attacked host has a large number of TCP connections waiting;* The system resources of the attacked host are heavily occupied, causing system pauses;* The network is filled with a large number of useless data packets. The source address is a fake address;* Network congestion is caused by heavy tra

advance, without long-tail words searched by these users. As a result, these popular words may not compete with other more advantageous websites, and those that should belong to their own traffic, the web pages with long-tail words placed in important locations are taken. In a large and medium-sized website, it is unwise to optimize resources in favor of popular keywords. From the perspective of maximizing website traffic, there is no doubt that long

Learning Algorithms from scratch: 10 sorting algorithms (medium)Author: matrix67 Date: 2007-04-06 font size: small, medium, and large. This article is divided into four sections by the gorgeous split line. For the O (nlogn) sorting algorithm, we will introduce Merge Sorting in detail and prove the time complexity of Merge Sorting. Then we will briefly introduce heap sorting, and then give the basic idea and

[LeetCode] 003. Longest Substring Without Repeating Characters (Medium) (C ++/Java/Python), leetcoderepeating Index: [LeetCode] Leetcode index (C ++/Java/Python/SQL)Github: https://github.com/illuz/leetcode 003. Longest_Substring_Without_Repeating_Characters (Medium) Link: Title: https://oj.leetcode.com/problems/Longest-Substring-Without-Repeating-Characters/Code (github): https://github.com/illuz/leetcod

[LeetCode] 012. Integer to Roman (Medium) (C ++/Java/Python), leetcodepython Index: [LeetCode] Leetcode index (C ++/Java/Python/SQL)Github: https://github.com/illuz/leetcode012. Integer_to_Roman (Medium) Link: Title: https://oj.leetcode.com/problems/integer-to-roman/Code (github): https://github.com/illuz/leetcode Question: Convert the decimal to the number of Rome. Analysis: Simulate it. "The Basic symbols

[LeetCode] 011. Container With Most Water (Medium) (C ++/Java/Python), leetcodecontainer Index: [LeetCode] Leetcode index (C ++/Java/Python/SQL)Github: https://github.com/illuz/leetcode 011. Container_With_Most_Water (Medium) Link: Title: https://oj.leetcode.com/problems/container-with-most-water/Code (github): https://github.com/illuz/leetcode Question: For some baffle plates, select two baffle plates to

30 thousand kilometers. magotan's replacement cycle is shorter and the cost is higher. At the same time, magt's working hours can be regarded as the daily price of medium-sized vehicle maintenance. The hourly fee for a normal maintenance is about 400 yuan, and the hourly fee for the replacement of the brake oil of only 60 yuan has actually reached 400 yuan. The hourly fee for the gearbox oil of about 600 yuan is not comparable to that for normal vehi

Many project managers who have worked on small and medium-sized projects have such feelings that it is difficult to maintain the software during the maintenance period. Why? 1. The customer's final requirements have changed too much at the beginning of requirement analysis. 2. the buckets that are not tested in the software development project cause some error data in the database. Then some small tools of software engineers were corrected. But the

[LeetCode] 039. Combination Sum (Medium) (C ++), combinationleetcode Index: [LeetCode] Leetcode index (C ++/Java/Python/SQL)Github: https://github.com/illuz/leetcode 039. Combination Sum (Medium) Link: Title: https://leetcode.com/problems/combination-sum/Code (github): https://github.com/illuz/leetcode Question: A positive integer set and a target number are given. You can select a number from the set so

The Wall (medium)Heidi the Cow is aghast:cracks in the northern Wall? Zombies gathering outside, forming groups, preparing their assault? This must not happen! Quickly, she fetches her HC2 (Handbook of Crazy Constructions) and looks in the right chapter:How to build a wall: Take a set of bricks. Select one of the possible wall designs. Computing the number of possible designs is left as a exercise to the reader. Place bricks on top of

3Sum (Medium) descriptionGiven an array nums of n integers, is there elements a, B, C in nums such that A + B + c = 0? Find all unique triplets in the array which gives the sum of zero.Note:The solution set must not contain duplicate triplets.Example:Given array nums = [-1, 0, 1, 2, -1, -4],A solution set is:[ [-1, 0, 1], [-1, -1, 2]]AnalysisThe first is the most easily thought of brute force, by iterating through the array nums , sequentially deter

Isequaltostring:[contact name]]) {[Array removeobject:contact];Returnc = Contact;NewKey = key;}}}[[_contactlist Objectforkey:newkey] removeobject:c];}Delete all contacts under a group-(void) Removeallcontactsbygroupname: (NSString *) GroupName {[_contactlist Removeobjectforkey:groupname];}Show All Contacts-(void) Showallcontacts {Nsarray *allkeys = [_contactlist AllKeys];Nsarray *newarray = [AllKeys sortedarrayusingselector: @selector (compare:)];For (NSString *key in NewArray) {Nsmutablearray

Palindrome Linked ListImplement a function to check if a linked list is a palindrome.ExampleGiven 1->2->1 , return TrueChallengeCould do it in O (n) time and O (1) space?////1\find out the medium index of Linked list2\ reverse the right part of linked list in place3\compare their value;/*** Definition for singly-linked list. * public class ListNode {* int val; * ListNode Next; * ListNode (int X) {val = x;}}*/ Public classSolution {/** * @paramhead

former group of technology represents the Java language to the network IO Model encapsulation (see this series of article "Architecture Design: Inter-system Communication (3)--io communication model and Java Practice", "Architecture design: Inter-system Communication (4)-- IO communication model and Java practice Medium, Architecture Design: Inter-system Communication (5)--io communication model and Java practice in the next chapter). Netwo

IPMI from drive to Application (medium )In the previous article, we talked about the IPMI underlying hardware connection and the implementation of the kernel driver, which facilitated the application developer by simply opening the operation with standard device files and invoking the available IOCTL to the BMC Send the request or read the response result.In addition to using this approach, application development engineers can leverage existing open