Tag: exit

Centos8 compiles and installs nginx. When starting nginx, an error message appears. Job for nginx.service failed because the control process exited with error.

nginx compilation and installation Official source code package download address https://nginx.org/en/download.html Example: Compile and install #1. Install related packages [root@test1 ~]# yum -y install gcc pcre-devel openssl-devel zlib-devel #Source code installation requires preparing a standard compiler in advance [root@test1 ~]# useradd -s /sbin/nologin nginx [root@test1 ~]# cd /usr/local/src/ #2. Unzip the package [root@test1 src]# tar […]

[C++ rewriting the bottom layer of Skynet 01] skynet actual combat—sunnet basic framework, create, start, wait for thread exit methods, imitate skynet to write message class

[C++ Rewriting Skynet Bottom Layer 01] Skynet Practical Combat-sunnet basic framework, create, open, wait for thread exit methods, imitate skynet to write message classes [C++ Rewrite Skynet Bottom Layer 02] Skynet Practical Combat-Imitating Skynet to write service classes, object management under multi-threading, spin lock mutex program writing, hash table management objects, and summary of program […]

[Data structure] Complexity

Blog homepage: The little sheep has insomnia. Series of columns: “C Language” “Data Structure” “Linux”“Cpolar” Thank you everyone for your likesCollection?Comments Article directory 1. What is a data structure? 2. What is an algorithm? 3. Efficiency of Algorithm 4. Time complexity 4.1 The concept of time complexity 4.2 Big O asymptotic notation 4.2 Common time […]

[Data structure]–Time complexity and space complexity of algorithm

Table of Contents 1. Algorithm efficiency 1.Complexity of algorithm 2. Time complexity 1. The concept of time complexity 2. Big O asymptotic representation 3. Common time complexity calculation examples Example 1 Example 2 Example 3: Example 4: Example 5: Example 6: Example 7: Example 8: 3. Space complexity 1. Concept 2. Common space complexity calculation […]

The time complexity of the algorithm

Table of Contents I. Introduction 2. Time complexity 1. Time complexity definition 2. Time complexity description method 3. Example code Example 1 (take the item with the greatest impact) Example 2 (dropping coefficients) Example 3 (If the size relationship is uncertain, use the max function to get the maximum) Example 4 (constant time complexity is […]

[Time complexity and space complexity]

Foreword: First, let’s introduce the algorithm (Algorithm) An algorithm is a description of the steps to solve a specific problem. A “good” algorithm should achieve the following goals: correctness, readability, robustness, high efficiency, and low storage requirements The efficiency of an algorithm is measured by time complexity and space complexity. 1. Time complexity Time complexity […]

[Data Structure] Time Complexity and Space Complexity

After the algorithm is written into an executable program, it will consume time resources and space (memory) resources when running. Therefore, the quality of an algorithm is generally measured from two dimensions: time and space, namely time complexity and space complexity. time complexity: Mainly measures the running speed of an algorithm Space complexity: Mainly measures […]

Data structure – time complexity and space complexity

Introduction to data structure data structure algorithm 1. Algorithm efficiency 2. Time complexity 2.1 The concept of time complexity 2.2 Asymptotic representation of Big O 2.3 Common time complexity calculations 3. Space complexity Example 1: Example 2: Example 3: Example answers and analysis: Data structure Data structure is a way for computers to store and […]