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the highest-paid employees in each department: Employee name, department name, salary-The employee number with the highest wage in each departmentSELECT MAX (esal), dp_no,ename from EMP GROUP by Dp_no--Inner joins, group queries, aggregate functionsSELECT MAX (esal), ename,d.dp_name,d.dp_no from EMP e INNER joins dept D on E.dp_no=d.dp_no GROUP by D.dp_no-18. Which department has the highest average wage, showing the department number, the average wage--Query the average salary of each departme

[24 questions about network stream] ---- problem solving (partial, continuous update...), ---- Problem SolvingCombined with pilots
With PILOT: http://cogs.yeefan.us/cogs/problem/problem.php? Pid = 14Problem: create a virtual source sink andCode: http://cogs.yeefan.us/cogs/su

design an algorithm to find out the best pilot matching scheme, so that the Royal Air Force can send the most aircraft.For a given foreign pilot with a British pilot, programming to find the best pilot matching scheme, so that the Royal Air Force can send the most aircraft.Input format:The 1th line has 2 positive integers m and N. n is the total number of pilots of the RAF (NNext, there are 2 positive integers i and j for each line, indicating that the foreign pilot I can match the British pilo

it's already poor. At this point, can only ask people to answer.
Ask the answer is also a doorway, first of all, figure out who you should find the answer. Must be to the most authoritative place to find the answer, rather than casually looking for personal discussion (can be less detours, but also to avoid fraught). The open source project that you use, the project development team is of course the authority, so he submits issue to GitHub.
The last is the art of questioning, such as wo

Title DescriptionIn the past days, the farmer John's cow had no problem. But now they have a problem and a lot of questions. To be precise, they have P (1 Input* First line: N and P* 2nd ... P+1 Line: Line I contains a_i and b_i, respectively, is to do the first question of the desire to pay and complete payment.Output* First line: The minimum number of months fo

the area of software development into clearly defined issues (well-defined problem) and ambiguous questions (ill-defined problem). The former refers to issues that are clear in both initial and target States, such as the question of the Vatican tower. The latter refers to the initial state, the target State, or both are very vague problems, such problems are oft

problems themselves. Another reason may be the project's own requirements. For example, in order to have a competitive advantage, some difficult requirements will be put forward in implementation. In terms of difficulty, this type of problem won't be solved by engineers in their first response. The knowledge and experience of Engineers cannot be directly told to engineers to solve the problem. This is th

from the content of most or a considerable part of textbooks and training courses. What I want to share with my colleagues is my experience and experience in practice. These contents mainly focus on solving problems and thinking skills. Therefore, this article cannot solve a very specific problem. For example, you cannot find the answer to how to implement paging query in this article, and how to transmit

,-1,sizeof (x)); for (int i=0;iMedian of Sorted Arraysthere is sorted arraysnums1 andNUMS2of size M and n respectively. Find The median of the sorted arrays. The overall run time complexity should be O (log (M+n)).Test instructions: Gives two sequences, finds the median of two sequences combined, requires time complexity log (N+M)Idea: The problem is converted to find the two series combined with the K decimal, find the K decimal, you can divid

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Take notes on solving the problem of "Sword refers to offer" and "Sword refers to offer"Notes on solving the problem of sword pointing to offer
I have a total of 50 questions about "Sword finger offer". I have spent time using C ++ over the past two weeks, I would like to ma

Previously felt that the suffix automatic opportunity, ignored the suffix array, now found that the suffix array + binary function is very strong, and the suffix automaton does not seem to implement.Forward, convenient for teammates to look around. These days I also as soon as possible bad to mend.(Can not find the original blogger website, error)Suffix array Problem Solving summary:1. The number of distinc

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barrier points, so the complexity is related to the obstacle point, and the other is designed for the entire rectangle, so the complexity is related to the area of the rectangle. Although the two algorithms seem to have huge differences, their nature is interlinked, using the idea of maximum, from enumerating all the most effective sub-rectangles to find a solution to the problem.
It should be noted that in solv

Search question recommendation and solution report (updated in 8.28)
The previous posts were either too scattered or too messy, so now we will make a long-term update summary for each category.Format description: The question name is followed by the general difficulty of the individual question (for cainiao)Poj 1069-the Bermuda Triangle (hard)Http://acm.pku.edu.cn/JudgeOnline/problem? Id = 1069Fill the hexagonal with a given triangleSolution:

Chatting with a new employee, he responded to a question: He has always worked overtime recently, and working overtime is not finished, instead, the testing work often starts from the off-duty time. He worries about problems, so he has to stay with him. He thinks this is too bad. In fact, it is really bad. This is a problem.
Before responding to his questions, I asked a few

After analyzing the source code of Muduo Network Library, we try to complete an efficient Sudoku and eight-digit problem solving server.First of all, why choose these two questions? Sudoku has always been a favorite problem for aboutspeaker teachers, and has been mentioned several times in the Muduo network library for

Recently fascinated by the Www.wechall.net website, there are some computer-related problems challenges. There are many types of topics, such as: Encryption and decryption, steganography, network attack and defense, fun programming, mathematical logic and so on. The topic is simple, some difficult, need some knowledge and skill. Unlike other topics that challenge websites, users who register on other similar sites can be bound to wechall sites, and then Wechall provide ranking information, and a

elements one by one. Because we know the Data Type of each element, we know how much memory space each element occupies, in this way, we can simply obtain different elements through the displacement.
In contrast, although the composite data construction method used in this question is not so efficient, it is really a great idea.
However, let's take a look at question 2.6 in the future.
What is the problem s

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