Tag：Examples
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Time：2021-2-27
Article from:mp.weixin.qq.com/s/iBw-Jfz0b2tOn63…Xiaobian organized a PDF document:【Notes on new features of php8.0】 PHP 8.0.0 is currently the latest major version. It introduces some major changes, as well as many new features and performance optimizations1. PHP 8.0 introduces the much anticipated just in time (JIT) compiler, which can further improve the execution speed of PHP scripts 2. […]
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Time：2021-2-27
Titodata: professional short video data acquisition and processing platform. For more information, please contact:TiToDataMassive data collectionCollect 500 million pieces of data for customers every dayTiktok Kwai: covering the mainstream platform: TikTok, Zynn, YouTube, jitter, fast, 1688, little red book, lots of Taobao, American group, hungry, Taobao, micro-blog Request API Http: // host address / Douyin […]
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Time：2021-2-27
1. Introduction to backtracking Backtracking problem is the traversal process of decision tree. The following problems need to be considered for backtracking problem Path: the choice that has been made, that is, the path from the root node to the current node Selection list: what other choices can be made in the current situation, that […]
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Time：2021-2-27
The little fish is more lovely than the little fish describe People are more angry than people; fish are more difficult to die than fish. Xiaoyu recently took part in a “loveliness contest” to compare the loveliness of each fish. The fish in the competition are arranged in a row from left to right, […]
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Time：2021-2-27
1. Shuffle mechanism Shuffle refers to the data processing after the map() method and before reduce(). It is to distribute the result data output by maptask to reducetask according to the partition rules, and partition and sort the data in the process of distribution. 2. Partition In MapReduce calculation, sometimes the final output data needs […]
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Time：2021-2-27
Pseudo class selector focus within, which indicates that an element gets the focus, or the descendant of that element gets the focus. Focus, it or its offspring get the focus. This means that it, or its offspring, gets the focus and can trigger it:focus-within。Code example: //html <div class=”container” tabindex=”0″> <label for=”text”>Enter text</label> <input id=”text” type=”text” […]
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Time：2021-2-26
We briefly introduced the usage of async /. Await before, and we will introduce async /. Await in more detail in this section. Usage of Async There are two main uses of async: async function and asyn code block. These usages will return a future object, as follows: async fn foo() -> u8 { 5 […]
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Time：2021-2-26
On abstraction — Preface The story starts with a function that seems very simple: Please calculate the sum of two numbers. If you’re familiar with Python, you’ll think, “Wow! It’s so simple! ” Then write the following code: def Plus(lhs, rhs): return lhs + rhs So what about C? You need to face this problem: […]
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Time：2021-2-25
The Vue project of coding platform is continuously integrated into Tencent cloud Linux server key word:coding Vue Docker 1、 Preface Why do I need continuous integration? Let me first say that I don’t use the scenario before continuous integration After writing the code, use NPM build to edit it into a dist folder Open the […]
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Time：2021-2-25
139. Word splitting Title Source: leetcode https://leetcode-cn.com/problems/word-break subject Given a non empty string s and a dictionary worddict containing a list of non empty words, determine whether s can be split into one or more words in the dictionary by spaces. explain: Words in the dictionary can be reused when splitting. You can assume that […]
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Time：2021-2-23
41. Missing first positive number Title Source: leetcode https://leetcode-cn.com/problems/first-missing-positive subject To give you an unsorted integer array, please find the smallest positive integer that does not appear in it. Example 1: Input: [1,2,0] Output: 3 Example 2: Input: [3,4, – 1,1] Output: 2 Example 3: Input: [7,8,9,11,12] Output: 1 Tips: The time complexity of your […]
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Time：2021-2-23
When it comes to life cycle, the most classic problem is null pointer fn main() { { let r; { let x = 5; r = &x; } println!(“r: {}”, r); } } It can be seen that the scope of X does not work before printing, but r makes a reference to it, so […]
