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Observer modeThere are usually two models in the observer model, one observer and one observed. Literally, when the observed person has some behavior or change, it will notify the observer, and the observer will deal with it according to this behavior or change.Let's take a simple chestnut 🌰: Now there is a landlord (observer) whose house is p ...

1, Title Requirements Given a two-dimensional binary matrix containing only 0 and 1 and the size of rows x cols, find the largest rectangle containing only 1 and return its area.Example 1: Input: matrix = [["1","0","1","0","0"],["1","0","1","1","1"],["1","1","1","1","1"],["1","0","0","1","0"]] Output: 6 Example 2: Input: matrix = [] Outp ...

[tcallusdb knowledge base] restfulapi2 0 for generic table - [Pb] fieldgetrecord2 0 Introductionbrief introductionQuery the corresponding record, get the specified field and return. Compared with the specified fields returned by GetRecord (Select parameter), the difference is that FieldGetRecord filters on the server and the network traffic is ...

1. gitlab reference resources: Configure ssh key Why does Gitlub need SSH Key? Because Gitlub needs to recognize that the submission you push is really pushed by you, not pretended by others, and Git supports SSH protocol, Gitlub can confirm that only you can push as long as you know your public key. 1.1 create ssh key ssh-keygen -t rsa ...

Record Basic environment JDK8Python3.7 Setting up Spark environment in Window First install JDK8 and python 3, which will not be repeated here Install Hadoop 2 seven Download address: http://archive.apache.org/dist/hadoop/core/hadoop-2.7.7/hadoop-2.7.7.tar.gz decompression Download winutils of hadoop: https://github.com/stevelou ...

JdbcTemplate JdbcTemplate is Spring's encapsulation of JDBC to make JDBC easier to use. The JdbcTemplate is part of Spring. The JdbcTemplate handles the creation and release of resources. It helps us avoid some common mistakes, such as forgetting to always close the connection. It runs the core JDBC workflow, such as the establishment and exec ...

How is a famous log system designed Reprinted from: Manon turned over 1 Preface At the beginning of its birth, the Java Empire provided common functions such as collection, thread, IO and network, which attracted a large number of programmers from C and C + + territory, but intentionally or unintentionally ignored an important function: outp ...

Copyright notice: This article is the original article of the blogger and follows CC 4.0 BY-SA Copyright agreement, please attach the original source link and this statement for reprint. Link to this article: https://blog.csdn.net/takashi77/article/details/116655240 Lua is a process oriented and functional programming language, because Lu ...

100. Same tree Link: https://leetcode-cn.com/problems/same-tree/ See the link for the title description. Solution 1: breadth first search What took advantage of was the problem of traversing the binary tree just yesterday, so it was completed smoothly today. At the beginning, I wanted to complete the search with depth first, but the re ...

1) Experimental platform: punctual atom STM32MP157 development board 2) Purchase link: https://item.taobao.com/item.htm?&id=629270721801 3) Full set of experimental source code + manual + video download address: http://www.openedv.com/thread-318813-1-1.html 4) Official station B of punctual atom: https://space.bilibili.com/394620890 5) Punc ...