## bzoj3569 DZY Loves Chinese II

Title Link problem Give an undirected graph with \ (n \) points \ (m \) edges, and then ask \ (Q \) times. Each time you ask, \ (k \) edges will be given. You need to answer whether the undirected graph is connected or not after deleting the \ (k \) edges. $$n\le 10^5,m\le 5\times 10^5,k\le 15$$ solution First, find out a \ (dfs \) tree, and co ...

Posted by melbell on Mon, 25 May 2020 07:05:33 -0700

## What are references and how to use them? Use reference as function parameter, relevant examples

What is reference? int a; int &b=a; Above is the reference to the variable Sign & it's not the meaning of going to address, it's the meaning of going to address when it's a pointer, here it's a reference. (this quotation is not a verb, but a noun.) Definition of reference: a "reference" can be created for a data. Its function ...

Posted by 00tank on Sun, 24 May 2020 08:14:12 -0700

## Learning C language [8] looking for single dog

Only two numbers in an array appear once, and all other numbers appear twice. Write a function to find the two numbers that only appear once. LeetCode: Once only numbers, title links Example Input: [1,2,3,4,5,2,1,3] Output: 4, 5 Method 1: sort the array first, and then compare the adjacent numbers to see if they are the same. Figure: #inclu ...

Posted by r4r4 on Sat, 09 May 2020 08:15:00 -0700

## Non rigid face recognition practical

Object oriented design Like face detection and face recognition, face tracking consists of two parts: data and algorithm. The algorithm trains the model by storing (i.e. offline) data in advance, and then performs some operations on the new (i.e. online) data. Therefore, object-oriented design is a good choice. In opencv 2.x version, it is conv ...

Posted by intodesi on Mon, 04 May 2020 06:40:03 -0700

## The 7th Blue Bridge Cup winter work

Please indicate the source of Reprint: http://www.cnblogs.com/zhishoumuguinian/p/8365430.htmlWinter work Now the math problems in primary school are not so interesting. Look at this winter vacation assignment. Each box represents a number from 1 to 13, but it can't be repeated. □ + □ = □ □ - □ = □ □ × □ = □ □ ÷ □ = □ For example: and: 6 ...

Posted by Rianna on Sun, 03 May 2020 06:24:45 -0700

## UE4 draw a ray with code

We all know that the ray in UE is very important. We will use blueprint to add components But I will not use C + + to add. Today, I will teach you how to use C + + code to realize it IDE:VS2017 UE version: 4.17 First rendering: We create a C + + project to give empty After startup, press F8 to select the default pawn and add a blueprint script ...

Posted by matvespa on Sat, 02 May 2020 02:31:12 -0700

## [HNOI2002] - Luogu 2234 - turnover statistics - tree

First exercise blog!! This question is relatively simple. The question is to input a sequence. Every time you insert one, find the value that has the smallest difference with the previous one, and add their difference into the answer. You can think of the balance tree here. Every time you input it, add it to the tree, then find its precursor an ...

Posted by kalebaustin on Fri, 01 May 2020 08:21:37 -0700

## Inversion of Mobius

Write in front This is the first time konjaku has written such a long blog $$gyh\ nb$$，$$\text{OI-Wiki}\ nb$$ If you think it's OK to write, please click support \ (qwq \) Prior knowledge Product function,Dirichlet convolution,Number theory is divided into parts (go to gyh for this article, I can't talk about it well) (make up slowly when you ...

Posted by jmr3460 on Tue, 28 Apr 2020 21:28:32 -0700

## Note 6: array of compound types

What is an array An array is an ordered sequence of elements, a collection used to store data of the same type. Definition of array 1. Declaration formula (one dimension) 1. Static array typeName arrayName[arraySize]; 2. Dynamic array typeName* arrayName = new typeName[arraySize]; 2. Explanation of array terms Array name There will be a set n ...

Posted by SlimSlyk on Fri, 24 Apr 2020 09:41:27 -0700

## freecplus framework - log file operation

1, Source code description Freecplus is a C/C + + open source framework under Linux system. Please go to the C language technology network (www.freecplus.net) to download the source code. This paper introduces the method of log file operation in freecplus framework. The declaration file for functions and classes is freecplus / 65124; freecplus ...

Posted by Kardall on Mon, 20 Apr 2020 10:56:26 -0700