feat(example): add figure and listing example

Author: colinaaa

book.tex

@@ -5,10 +5,14 @@
 \usepackage{subcaption}
 \usepackage[ruled,linesnumbered]{algorithm2e}
 \usepackage{hyperref}
+\usepackage{listings}
 
 \def\figureautorefname{图}
+
 \SetAlgorithmName{算法}{算法}{算法索引}
 
+\renewcommand*{\lstlistingname}{代码}
+
 \title{何老师算法课笔记}
 \subtitle{还没有想好的副标题}
 \author{计卓1801全体}

src/example.tex

@@ -47,6 +47,48 @@ \section{环境}
     \end{enumerate}
 \end{itemize}
 
+这是一张图片：
+
+\begin{figure}[hbt]
+  \centering
+  \includegraphics{image/dynamic-programming-1.png}
+  \caption{这是一张图片}\label{fig:example}
+\end{figure}
+
+这是一段代码：
+
+\begin{lstlisting}[language=Python, caption=Python example]
+import numpy as np
+
+def incmatrix(genl1,genl2):
+    m = len(genl1)
+    n = len(genl2)
+    M = None #to become the incidence matrix
+    VT = np.zeros((n*m,1), int)  #dummy variable
+
+    #compute the bitwise xor matrix
+    M1 = bitxormatrix(genl1)
+    M2 = np.triu(bitxormatrix(genl2),1)
+
+    for i in range(m-1):
+        for j in range(i+1, m):
+            [r,c] = np.where(M2 == M1[i,j])
+            for k in range(len(r)):
+                VT[(i)*n + r[k]] = 1;
+                VT[(i)*n + c[k]] = 1;
+                VT[(j)*n + r[k]] = 1;
+                VT[(j)*n + c[k]] = 1;
+
+                if M is None:
+                    M = np.copy(VT)
+                else:
+                    M = np.concatenate((M, VT), 1)
+
+                VT = np.zeros((n*m,1), int)
+
+    return M
+\end{lstlisting}
+
 更多环境请见文档。
 
 \section{引用}