adb logcat *:E

03-14 15:56:16.090 20886 20886 E WebViewFactory: Chromium WebView package does not exist
03-14 15:56:16.090 20886 20886 E WebViewFactory: android.webkit.WebViewFactory$MissingWebViewPackageException: Failed to load WebView provider: No WebView installed

03-14 15:56:16.177 20886 20886 E DeviceDoctorHandler: FATAL EXCEPTION: main
03-14 15:56:16.177 20886 20886 E DeviceDoctorHandler: Process: com.google.android.gms.ui, PID: 20886
03-14 15:56:16.177 20886 20886 E DeviceDoctorHandler: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.android.gms/com.google.android.gms.auth.uiflows.minutemaid.MinuteMaidActivity}: android.util.AndroidRuntimeException: android.webkit.WebViewFactory$MissingWebViewPackageException: Failed to load WebView provider: No WebView installed

03-14 19:29:40.418 16063 16063 E AndroidRuntime: FATAL EXCEPTION: main
03-14 19:29:40.418 16063 16063 E AndroidRuntime: Process: com.android.inputmethod.latin, PID: 16063
03-14 19:29:40.418 16063 16063 E AndroidRuntime: java.lang.RuntimeException: Unable to resume activity {com.android.inputmethod.latin/com.google.android.apps.inputmethod.latin.preference.SettingsActivity}: java.lang.RuntimeException: Preference xml file not specified

adb shell ls -lR | grep inputmethod
adb shell ls -lR | grep LatinIMEGooglePrebuilt

adb shell "pm list packages -f"

adb uninstall com.android.inputmethod.latin
adb install -r GBoard.apk

adb shell pm clear com.android.inputmethod.latin
adb install -r GBoard.apk

% These commands are used to identify and select the hard drive

diskpart
 
list disk
 
sel disk 
 
% These commands are used to list the partitions, select the Boot EFI partition, 
% then assign it a drive letter
 
list vol
 
sel vol 2
 
assign letter=D:
 
exit
 
% These commands are used to change into the Boot EFI folder and delete the GRUB folder
 
cd /d D:
 
ls
 
ls EFI
 
cd EFI
 
ls
 
rmdir /s ubuntu

diskpart
select disk 0
select partition 3
delete partition override
exit

ipconfig

Wireless LAN adapter Local Area Connection* 15:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::99f2:dfc9:5e94:373c%27
   IPv4 Address. . . . . . . . . . . : 192.168.137.1
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :

adb reboot bootloader
fastboot devices
fastboot flashing unlock
fastboot reboot

fastboot devices
fastboot flash boot N2G48B_4Cores.img

adb devices
adb sideload angler-ota-n2g48b-*.zip

This package is for "angler" devices; this is a "".

service ssh status
service ssh restart

netstat –nlp | grep 22

tee 

adb devices
adb shell
adb pull /data/data/com.tencent.mm/MicroMsg/xxxx/EnMicroMsg.db .

Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\InputMethod\Settings\CHS]
"LangBar Force On"=dword:00000000
"Enable Double Pinyin"=dword:00000001
"EmoticonTipTriggerCount"=dword:00000001
"HapLastDownloadTime"=hex(b):eb,69,29,59,00,00,00,00
"UserDefinedDoublePinyinScheme0"="FlyPY*2*^*iuvdjhcwfg xmlnpbksqszxkrltvyovt"
"DoublePinyinScheme"=dword:0000000a
"UDLLastUpdatedTime"="2017-05-27 22:01:40"
"UDLCount"=dword:0000018b
"UDLVisibleCount"=dword:0000018b

\usepackage[colorinlistoftodos]{todonotes}

\todo[inline, color=green!40]{This is an inline comment.}

\usepackage{enumitem}

\maketitle
\begin{enumerate}[label=(\alph*)]
\item an apple
\item a banana
\end{enumerate}

\verb|.bib|

\href{https://www.overleaf.com/blog/184}{Mendeley}

a\equiv b \bmod p

x^{(1)}=\begin{bmatrix}\frac{3}{2}\\[0.3em]\frac{9}{4}\end{bmatrix}, 

\documentclass[chi_draft]{sigchi}
\begin{document}
%\usepackage{natbib}

\title{}
\author{}

\maketitle

\input{abstract}


\input{intro}
\input{related}
\input{data}
\input{problem}
\input{observations}
\input{approach}
\input{exp}
\input{conclusion}

\bibliographystyle{SIGCHI-Reference-Format}
\bibliography{references}

\end{document}

\begin{alignat*}{2}
\min\quad & -2x_1-x_2+x_3 \\
\mbox{s.t.}\quad
&x_1+x_2+2x_3 \le 6  \\
&x_1+4x_2-x_3 \le 4  \\
&x_1, x_2, x_3 \ge 0
\end{alignat*}

\noindent
\textbf{}
\LaTeX{}
\TeX\
\TeX{}
\textbackslash
\textit{} 
\empha{}
{\bf }
\smallskip
\bigskip

\begin{center}
\begin{tikzpicture}[domain=0:0.5,xscale=13,yscale=3.8]
\draw[<->] (0,2) node[left]{EUR}-- (0,0) -- (.7,0) node[below] {$q$};
\draw[red] plot (\x, {0.25+\x/2+\x*\x/2}) node[right] {$v_1(x)$};
\draw[green] plot (\x, {0.025+\x+\x*\x}) node[right] {$v_2(x)$};
\draw[thin, dashed] plot (\x, {0.275+1.5*\x+1.5*\x*\x}) ;
\draw[thick,domain=0:0.33666] plot (\x, {0.05+2*\x+2*\x*\x}) ;
\draw[thick,domain=0.33666:0.5]
plot (\x, {0.5+\x+\x*\x}) node[right] {$2\min[v_1,v_2]$};
\end{tikzpicture}
\end{center}

\begin{tabular*}{0.75\textwidth}{@{\extracolsep{\fill} } | c | c | c | r | }
  \hline
  label 1 & label 2 & label 3 & label 4 \\
  \hline 
  item 1  & item 2  & item 3  & item 4  \\
  \hline
\end{tabular*}

{
\begin{table}
\caption{Statistics of the Dataset}
\label{tab:dataset}
\centering
    \begin{tabular}{c|c|c|c}
    \hline \hline
    \multirow{3}{*}{Science}   & \multirow{2}{*}{Video} & Count & \\ \cline{3-4}
                               &						& Avg. length & \\ \cline{2-4}
                               & User & Count &  \\ \cline{2-4}
                               & \multirow{3}{*}{Back-jumps} & Count &       \\ \cline{3-4}
                               &				             & Max back-jumps/video &       \\ \cline{3-4}
    						   &							 & Min back-jumps/video &       \\ \cline{2-4}
    \hline \hline
    \end{tabular}
\end{table}
}

\usepackage{caption} 
\captionsetup[table]{skip=10pt}

\documentclass{article}
 
\begin{document}
First document. This is a simple example, with no 
extra parameters or packages included. \cite{knuthwebsite}.
\end{document}

sudo apt-get install texlive
pdftex /path/to/myfile.tex

\documentclass{article}
\usepackage{natbib}
 
\begin{document}
First document. This is a simple example, with no 
extra parameters or packages included. \cite{knuthwebsite}.

\bibliographystyle{alpha}
\bibliography{article}
\end{document}

@misc{knuthwebsite,
    author    = "Donald Knuth",
    title     = "Knuth: Computers and Typesetting",
    url       = "http://www-cs-faculty.stanford.edu/\~{}uno/abcde.html"
}

alias texbib='pdflatex main.tex && bibtex main && pdflatex main.tex && pdflatex main.tex && gnome-open main.pdf'

\documentclass{article}
\usepackage{xeCJK}

\setCJKmainfont{simsun.ttf}
\setCJKsansfont{simhei.ttf}
\setCJKmonofont{simfang.ttf}
 
\begin{document}

\title{作业}
\author{宋正阳}
\date{\today}

\maketitle

\end{document}

Fontconfig warning: "/etc/fonts/conf.d/65-droid-sans-fonts.conf", line 96: Having multiple values in <test> isn't supported and may not work as expected

sudo apt install --reinstall fontconfig

<test name="lang">
  <string>zh-cn</string>
  <string>zh-sg</string>
  <string>zh-hk</string>
  <string>zh-tw</string>
  <string>zh</string>
</test>

<test name="lang">
  <string>zh-cn</string>
</test>

# abc123\b123\b  -> abc1212
# abc1212        -> abc1212

def convert(s):
    res = []
    index = 0
    for i in range(len(s)):
        # abc12123
        if s[i] != '\b':
            if len(res) == index:
                res.append(s[i])
            else:
                res[index] = s[i]
            index += 1
        else:
            if index == 0:
                continue
            else:
                index -= 1
        return ''.join(res[:index])

def compare(s1, s2):
    return convert(s1) == convert(s2)

def get_char(s, p):
    cnt = 0
    while p >= 0 and (cnt > 0 or s[p] == '\b'):
        if s[p] == '\b':
            cnt += 1
        else:
            cnt -= 1
        p -= 1
    return p

def compare_(s1, s2):
        p1 = len(s1) - 1
        p2 = len(s2) - 1
        
        while p1 >= 0 and p2 >= 0:
            p1 = get_char(s1, p1)
            p2 = get_char(s2, p2)

            if p1 >= 0 and p2 >= 0:
                if s1[p1] != s2[p2]:
                    return False
                else:
                    p1 -= 1
                    p2 -= 1

        p1 = get_char(s1, p1)
        p2 = get_char(s2, p2)
        return p1 < 0 and p2 < 0

assert(compare_('', '2\b') == True)
assert(compare_('', '12\b') == False)
assert(compare_('1', '12\b') == True)
assert(compare_('', '\b2\b') == True)
assert(compare_('', '12\b2\b') == False)
assert(compare_('1', '123\b2\b\b') == True)