unordered_map multi thread crash in find
collapse Recently, there was a crash in the program. After query, it was found that the crash occurred in the query of STL container. The screenshot of the crash is as follows: About unordered_map Unordered map container_ The map container does not sort the stored data like the map container. uUTF-8...
Posted by meomike2000 on Thu, 23 Sep 2021 15:03:39 +0530
Educational Codeforces Round 114 (Rated for Div. 2)
A.Regular Bracket Sequences Problem Analysis Given integer n n n. Structure n n n with length of 2 n 2n 2n and output, n ā [ 1 , 50 ] n \in [1, 50] nā[1,50]. Idea: construct directly according to the following rules n n Group n. i = 1 , ( ) ( ) ( ) ( ) . . . i = 2 , ( ( ) ) ( ) ( ) . . . i = 3 UTF-8...
Posted by ezbie on Thu, 23 Sep 2021 20:26:06 +0530
Convolution image filtering in OpenCV
Have you ever tried blurring or sharpening an image with the help of Photoshop or a mobile app? If so, you have used convolution kernels. Here, we will explain how to use convolution for image filtering in OpenCV. You will use 2d convolution kernel and OpenCV computer vision library to apply diUTF-8...
Posted by CoderGoblin on Fri, 24 Sep 2021 05:09:11 +0530
Image threshold in OpenCV Foundation
Thresholding has many applications in computer vision and is usually performed in the initial stages of many processing pipelines. There are several types of threshold algorithms. Let's focus on the "global" threshold. The article includes the following parts: 1. Global threshold method2. BinarUTF-8...
Posted by jimmyo on Fri, 24 Sep 2021 06:21:38 +0530
Joint query set of data structure
Main purpose Merge two setsDetects whether two elements are in the same collection Basic principles Each set is represented by a tree. The number of the tree root is the number of the whole set. Each node stores its parent node, and p[x] represents the parent node of X Related questions: How toUTF-8...
Posted by Bullit on Fri, 24 Sep 2021 20:27:12 +0530
Modern C++ Compile-Time Structural Field Reflection
Based on C++ 14 native syntax, less than 100 lines of code: let the compiler help you write JSON serialization/deserialization code, say goodbye to manual work. This article does not discuss the complete C++ reflection technology, but only the field reflection of structs and its application in UTF-8...
Posted by stubarny on Sat, 25 Sep 2021 03:32:49 +0530
LeetCode--121. The best time to buy and sell stocks (C + + description)
// Source : https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock/ // Date : 2021-09-25 Title Description: Given an array of prices, its ith element prices[i] represents the price of a given stock on day I. You can only choose to buy this stock one day and sell it on a different day UTF-8...
Posted by UnknownPlayer on Sat, 25 Sep 2021 08:12:07 +0530
Kernel level thread implementation
preface Tips: This is mainly for the kernel thread switch_to's five paragraph theory program. Five paragraph Theory: Two sets of stacks for core level threads. The core is the kernel stack Switching process of core level threads: Tip: the following is the main content of this article, 1, InterUTF-8...
Posted by gbrown on Sat, 25 Sep 2021 10:21:26 +0530
Systematic thinking on C + + classes & some divergent ideas and applications of classes
1, Purpose and function of class The four characteristics of C + + are abstraction, encapsulation, polymorphism, inheritance and derivation. Personal understanding is that abstraction is the basis, encapsulation, inheritance and derivation are methods, and polymorphism is a tool. Generally speaUTF-8...
Posted by coolcat on Sat, 25 Sep 2021 13:02:52 +0530
TUM dataset building dynamic dense point clouds
Catalog PCL libraries are needed to build point clouds Implementing Difficulties 1.How Dense Reconstruction works 2.How to align rgb, depth and position maps 3.What is the camera's internal reference 4.How to display real-time pictures and point clouds Total Code The purpose of this article is UTF-8...
Posted by minc on Sat, 25 Sep 2021 21:31:03 +0530