## 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*