sample.tex

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%% LaTeX book template                           %%
%% Author:  Amber Jain (http://amberj.devio.us/) %%
%% License: ISC license                          %%
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\documentclass[a4paper,11pt]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{subcaption}
\usepackage[normalem]{ulem}
\usepackage{enumitem,kantlipsum}

%%%%%%%%%%%question block
\usepackage[tikz]{bclogo}
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% Source: http://en.wikibooks.org/wiki/LaTeX/Hyperlinks %
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\usepackage{hyperref}
\usepackage{graphicx}
\usepackage[english]{babel}
\usepackage{graphicx,amssymb,amstext,amsmath}
\usepackage{tikz}
\usepackage{cancel}

\usepackage{mathtools}
\DeclarePairedDelimiter\ceil{\lceil}{\rceil}
\DeclarePairedDelimiter\floor{\lfloor}{\rfloor}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 'dedication' environment: To add a dedication paragraph at the start of book %
% Source: http://www.tug.org/pipermail/texhax/2010-June/015184.html            %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newenvironment{dedication}
{
   \cleardoublepage
   \thispagestyle{empty}
   \vspace*{\stretch{1}}
   \hfill\begin{minipage}[t]{0.66\textwidth}
   \raggedright
}
{
   \end{minipage}
   \vspace*{\stretch{3}}
   \clearpage
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% The setting for the exercise part: we can write the problems and the solutions at the same place, but can be displayed in the pdf at another place %
% Source: https://tex.stackexchange.com/questions/369265/math-book-how-to-write-exercise-and-answers %
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\usepackage{multicol}
\usepackage{multirow}
\usepackage{ifthen}
\newboolean{firstanswerofthechapter}  

\usepackage{xcolor}
\colorlet{lightcyan}{cyan!40!white}

\usepackage{chngcntr}
\usepackage{stackengine}

\usepackage{tasks}
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% The setting for the chapter style %
% Source: https://texblog.org/2012/07/03/fancy-latex-chapter-styles/ %
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\usepackage[Sonny]{fncychap}
% \usepackage{titlesec}


%%%%%%%%%%%%%
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%  use underline in the lstlisting%
%%%%%%%%%%%%%%
%%%%%%%%%%%

\usepackage{upquote}

 
% \titleformat
% {\chapter} % command
% [display] % shape
% {\bfseries\Large}%\itshape} % format
% {Chapter No. \ \thechapter} % label
% {0.5ex} % sep
% {
%     \rule{\textwidth}{1pt}
%     \vspace{1ex}
%     \centering
% } % before-code
% [
% \vspace{-0.5ex}%
% \rule{\textwidth}{0.3pt}
% ] % after-code
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% The setting for the examples style %
% Source: https://tex.stackexchange.com/questions/295589/how-to-enumerate-a-problem-set-in-a-book-accordingly-with-the-chapter-number %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{enumitem}
\newlist{examples}{enumerate}{1}
\setlist[examples]{label={\thechapter.\arabic*}}

% \BeforeBeginEnvironment{example}{\vspace{\baselineskip}}
% \AfterEndEnvironment{example}{\vspace{\baselineskip}}
% \BeforeBeginEnvironment{sourcecode}{\vspace{\baselineskip}}
% \AfterEndEnvironment{sourcecode}{\vspace{\baselineskip}}

\newlength{\longestlabel}
\settowidth{\longestlabel}{\bfseries viii.}
\settasks{counter-format={tsk[r].}, label-format={\bfseries}, label-width=\longestlabel,
    item-indent=0pt, label-offset=2pt, column-sep={10pt}}

\usepackage[lastexercise,answerdelayed]{exercise}
\counterwithin{Exercise}{chapter}
\counterwithin{Answer}{chapter}
\renewcounter{Exercise}[chapter]
\newcommand{\QuestionNB}{\bfseries\arabic{Question}.\ }
\renewcommand{\ExerciseName}{EXERCISES}
\renewcommand{\ExerciseHeader}{\noindent\def\stackalignment{l}% code from https://tex.stackexchange.com/a/195118/101651
    \stackunder[0pt]{\colorbox{cyan}{\textcolor{white}{\textbf{\LARGE\ExerciseHeaderNB\;\large\ExerciseName}}}}{\textcolor{lightcyan}{\rule{\linewidth}{2pt}}}\medskip}
\renewcommand{\AnswerName}{Exercises}
\renewcommand{\AnswerHeader}{\ifthenelse{\boolean{firstanswerofthechapter}}%
    {\bigskip\noindent\textcolor{cyan}{\textbf{CHAPTER \thechapter}}\newline\newline%
        \noindent\bfseries\emph{\textcolor{cyan}{\AnswerName\ \ExerciseHeaderNB, page %
                \pageref{\AnswerRef}}}\smallskip}
    {\noindent\bfseries\emph{\textcolor{cyan}{\AnswerName\ \ExerciseHeaderNB, page \pageref{\AnswerRef}}}\smallskip}}
\setlength{\QuestionIndent}{16pt}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% design the code listing
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{listings}

\usepackage{float}

       
\usepackage{color}
 
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
 
\lstdefinestyle{mystyle}{
    backgroundcolor=\color{backcolour},   
    commentstyle=\color{codegreen},
    keywordstyle=\color{magenta},
    numberstyle=\tiny\color{codegray},
    stringstyle=\color{codepurple},
    basicstyle=\footnotesize,
    breakatwhitespace=false,         
    breaklines=true,                 
    captionpos=b,                    
    keepspaces=true,                 
    numbers=left,                    
    numbersep=5pt,                  
    showspaces=false,                
    showstringspaces=false,
    showtabs=false,                  
    tabsize=2
}
 
\lstset{style=mystyle}


%%%%%%%%%%%%%%%theorem, corollary and lemma 
\newtheorem{theorem}{}[section]
\newtheorem{corollary}{Corollary}[theorem]
\newtheorem{lemma}[theorem]{Lemma}
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% package enumberate with different style                                     %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{enumitem} %[label=(\alph*)], [label=(\Alph*)], [label=(\roman*)]
\usepackage{titlesec}

\usepackage[utf8]{inputenc}
%\setcounter{secnumdepth}{3} %subsubsection and paragraph

\newlist{inparaenum}{enumerate}{2}% allow two levels of nesting in an enumerate-like environment
\setlist[inparaenum]{nosep}% compact spacing for all nesting levels
\setlist[inparaenum,1]{label=\bfseries\arabic*.}% labels for top level
\setlist[inparaenum,2]{label=\arabic{inparaenumi}\emph{\alph*})}% labels for second level

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% better align the equation                                                     %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{notes}
\usepackage{amsmath}
\usepackage{subfiles}
\usepackage{subcaption} 
\usepackage{dramatist}
% \usepackage{blindtext}

% \setcounter{chapter}{-1}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Chapter quote at the start of chapter        %
% Source: http://tex.stackexchange.com/a/53380 %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\renewcommand{\@chapapp}{}% Not necessary...
\newenvironment{chapquote}[2][2em]
  {\setlength{\@tempdima}{#1}%
   \def\chapquote@author{#2}%
   \parshape 1 \@tempdima \dimexpr\textwidth-2\@tempdima\relax%
   \itshape}
  {\par\normalfont\hfill--\ \chapquote@author\hspace*{\@tempdima}\par\bigskip}
\makeatother

\title{\Huge \textbf{Combinatorial Search}}

% \title{\Huge \textbf{The Comprehensive Coding Interview Guide}  \footnote{This is a footnote.} \\ \huge  Cracking LeetCode Problems Using Python \footnote{This is yet another footnote.}}

% \title{\Huge \textbf{Notebook of Data Structures and Algorithms  for Coding Interview }  \footnote{This is a footnote.} \\ \huge  Cracking LeetCode Problems Using Python \footnote{This is yet another footnote.}}
% Author
\author{\textsc{Li Yin}\thanks{\url{www.liyinscience.com}}}
\begin{document}
\frontmatter
\maketitle
\subfile{chapters/chapter_combinatorial_search}
\label{chapter_advanced_linear_search}


% \part{Problem-Patterns}
% \label{part_question}

% \chapter{Array Questions(15\%)}
% \subfile{chapters/question_3_array_question}
% \label{array_problem}

% \chapter{Linked List, Stack, Queue, and Heap Questions (12\%)} %(44+34+9+31)
% \label{other_linear_datastrcutre_problem}
% \subfile{chapters/question_4_linked_list_question}


% \chapter{String Questions (15\%)}
% \label{chapter_string_problem}
% \subfile{chapters/question_5_pattern-matching}


% \chapter{Tree Questions(10\%)}
% \label{chapter_tree_problem}
% \subfile{chapters/chapter_12_tree_algorithm }


% \chapter{Graph Questions (15\%)}
% \label{chapter_graph_problem}
% \subfile{chapters/question_7_specific_algorithms_for_graph}

% % chapter 1
% \chapter{Dynamic Programming Questions (15\%)}
% \subfile{chapters/question_1_dynamic_programming}
% \label{dp_problem}

\end{document}    return ans
\end{lstlisting}