Programmer Think

Introduction of sorting When processing data, it is often necessary to search. In order to search quickly and accurately, the data to be processed is usually required to be arranged in order according to the size of key words, so as to adopt efficient search methods. Basic concept of sorting 1. rank ...

4.1 placeholder ": (1) An example of using placeholders in Shell scripts if [ $i -eq 1 ] #Conditional expression then : #If the if judgment statement is used in the Shell script, some operations are usually performed after the judgment is successful, but sometimes it is not known what operations are performe ...

Background introduction Scan the specified log directory every hour, empty the file directly after it exceeds 100M, and use it as a temporary means of operation and maintenance. The source code is mainly composed of two functions: reviewLogs() determines the log size and clears it; getdir() determines whether it is a dire ...

Article directory 1, Render props mode 1.1 overview of react component reuse 1.2 thinking analysis 1.3 operation steps 1.4 children instead of the render attribute 1.5 code optimization 2, High order components 2.1 overview 2.2 thinking analysis 2.3 use steps 2.3 settings ` displayName` 2.4 transf ...

man useradd can view the following useful information 1, User profile 1.1 user information file / etc/passwd root: x:0:0:root:/root:/bin/bash field Effect 1st field User name 2nd field Password flag x: indicates that the user has a password, and finally goes to / etc/shadow to find the passw ...

1. Manage user accounts 1. Overview of user accounts Linux controls access to resources based on user identity. 2. User Account Management 1) User Account Super user (root); Ordinary users; Program user; UID (User IDentify) user identification number; (1) User account file/etc/passwd The /etc/passwd file is used to hold basic informa ...

Seven sorting algorithms Direct insert sort Selection sort Selection sort Bubble sort Quick sort Merge sort Heap sort Direct insert sort When the I (I > = 1) element is inserted, the preceding array[0],array[1] , array[i-1] has been ordered. At this time, use the sorting code of array[i] and ...

First you need to install three packages: #Installation: pip install matplotlib #Installation: pip install jieba #Install pip install wordcloud 1. Make a word cloud of the English alphabet Design sketch: Code implementation: import matplotlib.pyplot as plt import jieba from wordcloud import WordCloud # 1. Read txt text data text = open(r'te ...

1. Simulation enters into Doze mode Set no charge state adb shell dumpsys battery unplug Set forced entry depth module adb shell dumpsys deviceidle force-idle deep Set alarm log on adb shell dumpsys alarm log on Then we can connect USB and view the log behavior dynamically in logcat. 2. IDLE Alarm wake-up delay in ...

meaning of the title   Sol It's a very good question. Fortunately, I didn't play this game. Otherwise, I guess I will die on this question qwq It doesn't mean how difficult it is. The key is that there are too many details. wcz and I had a chat about my ideas. Then he wrote it all night and didn't call out the qwq It's quite a routine ...