Introduction to color screen display: color setting and text display | ESP32 learning tour - Arduino version

Contents of this series of historical articles: ESP32 overview and Arduino software preparation Introduction to the programming of ESP32 GPIO interface Bluetooth pager (PPT controller) Novel coronavirus pneumonia epidemic data real-time display Fan counter of station B Siri voice recognition control LED Getting sensor data from Siri speech rec ...

Posted by PhilVaz on Mon, 22 Jun 2020 06:19:44 +0200

Solutions for C++ Shallow Copy and Shallow Copy

Shallow copy: taking the string class as an examplec++ Shallow Copy and Shallow Copy Solutions When copying a known object, the compilation system automatically calls a constructor, the copy constructor, or the default copy constructor if the user does not define a copy constructor.The default copy construction is a shallow copy, which is equi ...

Posted by sgboise on Wed, 17 Jun 2020 21:44:55 +0200

Review C++ Grammar--Memory Management

1, Draw Memory 2, new/malloc and delete/free new, delete are operators The malloc() function is responsible for leaving only a certain amount of memory, and it does not know or care about the object itself.Calling new not only allocates the correct size of memory, but also calls the corresponding constructor to build the object. free() and del ...

Posted by suntra on Sat, 13 Jun 2020 18:28:16 +0200

Operator overloading based on C + +

The concept of operator overloading ⚫ Expressions in C + + are composed of operators and operands according to rules. For example, arithmetic operators include plus "+", minus "-", multiply "*", divide "/" and modulus "%". Without special processing, these arithmetic operators can only be used ...

Posted by The Jackel on Sat, 06 Jun 2020 05:44:40 +0200

Binary Search Tree_BST

Catalog Binary Search Tree Definition Forms and basic properties Code base implementation Related Issues L2-004 Is this a binary search tree? Input format: Output format: thinking Problem Binary Search Tree Definition A binary search tree (English: Binary Search Tree), also known as a binary search tree, an ordered binary tree, or a so ...

Posted by dannyb785 on Sat, 30 May 2020 18:29:54 +0200

QuantLib Financial Calculations: An Analysis of Common Interest Rate Swap in a Case

Catalog QuantLib Financial Calculations: A Case Study of Ordinary Interest Rate Interchange (2) Summary Contract Terms practice Set RateHelper Bootstrap Verification Possible sources of difference Next step QuantLib Financial Calculations: A Case Study of Ordinary Interest Rate Interchange (2) Summary The functions involved in interest ...

Posted by mepaco on Fri, 22 May 2020 19:26:03 +0200

NOIP 2017 Day2 T1 cheese

luogu topic The only conscience question in two days, however, I have 70% honey in the exam room   There should be a lot of practices, and simple practices should include collection and search; I play and check the collection, but it seems like a group of DFS fast; The idea is very simple. It is to combine the holes that can be connected togeth ...

Posted by namasteaz on Sat, 02 May 2020 22:22:53 +0200

Luogu P3383 [template] linear sieve prime number (Miller_Rabin)

Title Description For example, given a range n, you need to deal with the question of whether a certain number M is a prime number (each number is in the range 1-N) I / O format Input format:   The first row contains two positive integers, N and M, which represent the range and number of queries respectively. Next, each row of row M conta ...

Posted by majocmatt on Sat, 02 May 2020 06:41:25 +0200

bzoj4036 [HAOI2015] bitwise OR

Title Link solution Use \ (f[i][j] \) to indicate the probability of \ (j \) after the \ (I \) operation. Then there are \ (f [i] [J] = \ sum \ limits {s | s | 2 = J} f [I - 1] [s | 1] \ times P [s | 2] \) So the probability that the number is \ (i \) after the \ (K \) operation is \ (P ^ k \ U i \). The multiplication here is set convolution. ...

Posted by Magneto on Sun, 26 Apr 2020 16:45:59 +0200

CentOS7 Configuration Firewall

I. The concept of firewalls Firewall technology is a technology that combines all kinds of software and hardware devices for security management and screening to help computer networks build a relatively isolated protection barrier between their internal and external networks to protect user data and information security. Professional firewall ...

Posted by Gondwana on Thu, 23 Apr 2020 02:21:08 +0200