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2020 Computer Guaranteed Research Records (Zhejiangsoft, Donghua, China Southern Airlines, Hehai)

2020 Computer Guaranteed Research Records (Zhejiangsoft, Donghua, China Southern Airlines, Hehai)Personal situationBasic InformationObtaining the number of research candidates + the timeline of researchHaitou pre-launch exemptionDonghua UniversityZhejiang UniversityHe Hai UniversityNanjing University of Aeronautics and Astronauticsotherto sum up Personal situation In 2020, Baoyan went ashore, and I read many experience posts during the preparation process. Now I use the spirit of the Internet and share my experience, hoping to help the next year's younger students~ (whatever you think of

2021-06-28 14:16:21   

2020 T Elevator Repair Free Test Questions and T Elevator Repair Test Skills

Source of question bank: Safety production mock exam, WeChat public account mini program 2020 T elevator repair free test questions and T elevator repair examination skills, including T elevator repair free test questions and answers and analysis, and T elevator repair exam skills practice. Combining the latest syllabus of the national T elevator repair exam and the summary of the real questions of the T elevator repair exam from the safety production simulation test, Yidiantong official account, will help the T elevator repair test questions and answers to practice before the exam. 1. [True

2021-06-28 14:16:00   

Linear regression-gradient descent [theory + case demonstration]

An overview of linear regression gradient descent theory In the previous KNN algorithm, we involved the problem of weight. In the linear regression gradient descent algorithm, the weight of 0 is specified first, and the formula is introduced to calculate the loss value. The new weight is calculated by the formula, and so on. Iteratively, find the most suitable step size, get the weight that is closest to the true value, and make predictions. data preparation Link: Practice data extraction code: lyq6 Code demo Import the jar package to read the data set import numpy as np import pandas as pd

2021-06-28 14:15:51   

Codeforces Round #673 (Div. 2)

A. Copy-paste Sign-in question Question: For a string of length n, variable value array, and maximum k, each time you can choose any two unequal numbers (i, j) in the range [1, n], so that a[ j] = a[ j] + a[ i ], when the maximum value in the array exceeds k (a[max]>k), the operation cannot be continued. Ask the maximum number of operations. Idea: Use the priority queue of the small top heap to store all values, first take out the smallest value and pop it, then add the second largest value to the smallest value, insert the summed value into the priority queue, and repeat the operation until

2021-06-28 14:15:46   

Fun talk about network protocols! Huawei's 18-level technical experts have worked hard to produce 545 pages of fairy documents!

The network uses physical links to connect separate workstations or hosts together to form a data link, so as to achieve the purpose of resource sharing and communication. Communication is the exchange and transmission of information between people through a certain medium. Network communication is to connect various isolated devices through the network, and realize the communication between people, people and computers, and computers and computers through information exchange. The most important thing in network communication is the network communication protocol. There are many network

2021-06-28 14:15:41   

Vue +element's Table encapsulates public components

The Table of element ui encapsulates common components! Since many forms are in the same format when working on a project, we waste space every time we introduce this and increase the amount of code. It is better to encapsulate the form into a public component, which is convenient for us to call at any time. table package one Here to call the component The event object for table operations This is about the two configuration columns and operation of the table (according to requirements, there are operations to configure, no operations for operation:[]) The following is the encapsulated public

2021-06-28 14:15:35   

Solve the problem that the pdf.js preview pdf does not display the signature (two ways)

Solve the problem that the pdf.js preview pdf does not display the signature (two ways) The way to solve this problem is very interesting. The idea to solve this kind of problem is: how to prevent pdf.js from throwing exceptions or warnings . [In fact, at first glance, it doesn’t seem to be related to the problem itself, haha] The electronic signature is not displayed, and it seems that this can be solved as well. Screenshot of the problem: The three grids in the signature column have signed names, but they are not displayed in the preview. The warning screenshot of the console: Perhaps yours

2021-06-28 14:15:29   

Python implements sequential search and hash search

Sequential search is very simple, just an appetizer, the main exercise today is hash search First look up the code in order: def sequence_search(array, num): for i in range(len(array)): if array[i] == num: return i return False array_0 = [23, 43, 12, 54, 65, 48] print(sequence_search(array_0, 12)) >>> 2 Look at the hash lookup: Algorithm idea The idea of ​​hashing is very simple. If all keys are integers, then you can use a simple unordered array to achieve: use the key as an index, and the value is its corresponding value, so that you can quickly access the value of any key . This is the case

2021-06-28 14:15:20   

Some questions about SQLite3 compilation and cross-compilation

Transfer from: http://blog.sina.com.cn/s/blog_5f2e119b0101ibwn.html SQLite3 (http://www.sqlite.org) is a very powerful small open source database software, especially embedded in some software to store data, of course, it is also very necessary to transplant to embedded systems. The well-known major mobile platforms such as Symbian, Android, and IOS use sqlite for data storage. Manufacturers using SQLite include Adobe, Airbus, Apple, Dropbox, Mozilla, GE, Google, McAfee, Microsoft, PHP, Python, Toshiba, etc. Wait. The current sponsors of SQLite include Oracle, Adobe, Mozilla, etc. The

2021-06-28 14:15:15   

Excel compares the data on both sides to remove duplication

Requirement: Filter duplicate data, column A is 1000 data, column C is 100 data, delete duplicate data, only 900 data are left. First of all, the data in column A should be divided into columns, because the data format is different, which will cause the following problems, and continue to the next step to complete The second step is to add the number 1 in the B and D columns, which is equivalent to an index, and the same data length is used for matching. The data in A and C in the following figure are reversed The third step, data-filter, and then filter out the C column data Finally, copy the

2021-06-28 14:15:09