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Compiling proto and related usage of proto 1. Compiling proto Reinstall the protoc ol for reference https://blog.csdn.net/u013498583/article/details/74231058 View the current protocol version: protocol -- version Check the installation location of protocol: which protoc ol Find the file related to the protocol: sudo find / - name protocol ...

QLineEdit can be used for many special processing purposes besides simple text boxes. Restrict input. Only IP addresses can be entered. To limit the input range, it is highly recommended to use QRegExpValidator regular expression for processing. //Limiting input for expression QString str = "\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9] ...

Strings, tuples, and dictionaries 1, String A string is an immutable sequence of several different unicode characters 1 . String creation #Single quote string str1 = 'It's going to rain. My mother wants to get married. Let him go' str2 = str() #Empty string str3 = str([10,20,30]) #Double quoted string str2 = "It's going to rain. My mother ...

preface object-oriented It is a very common programming idea. Through a practical project, this paper will take you into object-oriented and experience the application of object-oriented in practical development, which brings us convenience. The project of this paper comes from Dark horse programmer An example in a series of courses. Th ...

Preface: The so-called "simulation algorithm" used in the so-called simulation problems does not have a completely accurate definition. The analog algorithm, as the old saying goes, "Paint the ladle according to the gourd"; The official interpretation is that key elements are filtered and extracted according to the title de ...

Introduction to C + + Basics 1. Initial knowledge of C + + 1.1 the first C + + program Writing a C + + program is divided into four steps Create projectcreate a fileWrite codeRun program 1.1.1 create project Visual Studio is the main tool we use to write C + + programs. Let's open it first 1.1.2 creating files Right click the source ...

sort Quick sort The core idea of fast platoon is divide and conquer. Choose one as a sentry, so that the number less than or equal to it is on the left and the number greater than or equal to it is on the right The time complexity is n(logn) The steps are roughly divided into the following three steps: Determine the dividing pointAdjust ...

Problem description Topic background After the outbreak of an epidemic in a certain place, we want to inform all residents who have recently passed through the high-risk area to participate in nucleic acid testing in accordance with the principle of "testing as much as possible". Problem description In order to find out the re ...

This article explains several questions often asked in C + + interview. This article explains the frequently asked questions such as initialization list, inheritance and string through demo. Look at the example below Initialization list //Base class class Base { public: Base() : m_nbase(0), m_nbase2(m_nbase + 100) {} Base(int n) : m_n ...

Personal blog portal, welcome to visit Tree: Definition: a tree has at most one root node. The terminal of each path is called terminal node, also known as leaf node. A node that is neither a root nor a leaf is called an intermediate node, and the line between the node and the node is called an edge. From bottom to top, it is called height * ...