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preface: With the development of science and technology and the unique living environment, more and more people pursue the progress of science and technology. Therefore, in today's architectural decoration engineering, we should not only consider the needs of customers and the coordination and unity with the building structure, but also consi ...

Topic & Translation Problem solution although m m m is big, but n n n is very small, so the title allows us to O ( ...

1, Reversal of linked list (Leedcode.206 reverse linked list) Reverse a linked list and define two pointers, one to replace the head node and the other to point to the next node. Then, instead of the pointer of the head node, go to the node that needs to be exchanged to carry out the operation similar to the head insertion method, and fi ...

---------------------Basic concepts and principles------------------------ 1.1 routing Routing is a broad and abstract concept. The essence of routing is correspondence. In development, routing is divided into: Back end routing Concept: return different contents according to different user URL requests Essence: the correspondence between the ...

Official website: https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.aggregate.html objective The main line of this article is to explore the basic usage of agg and the corresponding applicable scenarios, and finally make a simple exploration of the source code layer. 1. This paper introduces the parameters of agg and its demo 2. ...

This article will take you to build a car detector, using the algorithm of PyTorch version of YOLOV3. We will not explain the details of the algorithm, but focus on how to implement our own car detector, mainly including data download, data cleaning, data set production, training and detection (image detection, video detection). Even if you don ...

Mirrored hierarchy Shared host kernel base image provides the smallest linux system The same docker host supports running multiple linux distributions The biggest advantage of adopting hierarchical structure is to share resources Copy in write writable container layer All mirror layers below the container layer are read-only docke ...

**Freight service network design: reading notes of classic literature (2) **It was mentioned that the model used in cranic T g (1984) should be reproduced, but the general framework given in the article is still too general. After trying, it was decided to use Netplan (1989) for LCL freight proposed by Jacques Roy & Louis Delorme on the bas ...

summary HashMap allows null keys and values. Hashtable does not allow null values or null keys. NullPointerException will be thrown. The time complexity of get put is constant. HashMap has two parameters that affect its performance: initial capacity, initial capacity and load factor. Capacity refers to the number of bucket s, that is, the l ...

Asynchronous log The biggest feature of log4j2 is asynchronous logging. Its performance improvement mainly benefits from asynchronous logging. Let's see how to use log4j2 asynchronous logging. Synchronization log Asynchronous log Log4j2 provides two ways to implement logging, one through AsyncAppender and the other through asyncloger, cor ...