Update htc.md

diff --git a/docs/intro/htc.md b/docs/intro/htc.md
index 8f7ee90..b15a7c6 100644 (file)
--- a/docs/intro/htc.md
+++ b/docs/intro/htc.md
@@ -159,48 +159,42 @@ LaTeX 作为公式排版的首选，我们应当正确地使用它。因此对
 
 伪码具体格式没有严格要求，请参考算法导论或学术论文，注意不要写成 Python。
 
-Wiki 内使用 LaTeX 书写伪码，缩进使用 `$\qquad$` ，文字描述使用 `$\text$` ，关键字使用 `$\textbf$` ，赋值使用 `$\gets$` 。
-
- $\begin{aligned}\textbf{Input.}&\text{ The edges of the graph }e\text{, where each element in }e\text{ is }(u, v, w)\\&\text{ denoting that there is an edge between }u\text{ and }v\text{ weighted }w\text{.}\end{aligned}$ 
-
- $\textbf{Output.}\text{ The edges of the MST of the input graph.}$ 
-
- $\textbf{Method.}$ 
-
- $result \gets \varnothing$ 
-
- $\text{sort }e\text{ into nondecreasing order by weight }w$ 
-
- $\textbf{for}\text{ each }(u, v, w)\text{ in the sorted }e$ 
-
- $\qquad\textbf{if }u\text{ and }v\text{ are not connected in the union-find set}$ 
-
- $\qquad\qquad\text{connect }u\text{ and }v\text{ in the union-find set}$ 
-
- $\qquad\qquad result \gets result\ \bigcup\ \{(u, v, w)\}$ 
-
- $\textbf{return }result$ 
+Wiki 内使用 LaTeX 书写伪码，整体处于 array 环境中，缩进使用 `$\qquad$` ，文字描述使用 `$\text$` ，关键字使用 `$\textbf$` ，赋值使用 `$\gets$` 。
+
+参考示例：
+
+$$
+\begin{array}{ll}
+1 &  \textbf{Input. } \text{The edges of the graph } e , \text{ where each element in } e \text{ is } (u, v, w) \\
+  &  \text{ denoting that there is an edge between } u \text{ and } v \text{ weighted } w . \\
+2 &  \textbf{Output. } \text{The edges of the MST of the input graph}.\\
+3 &  \textbf{Method. } \\ 
+4 &  result \gets \varnothing \\
+5 &  \text{sort } e \text{ into nondecreasing order by weight } w \\ 
+6 &  \textbf{for} \text{ each } (u, v, w) \text{ in the sorted } e \\ 
+7 &  \qquad \textbf{if } u \text{ and } v \text{ are not connected in the union-find set } \\
+8 &  \qquad\qquad \text{connect } u \text{ and } v \text{ in the union-find set} \\
+9 &  \qquad\qquad  result \gets result\;\bigcup\ \{(u, v, w)\} \\
+10 &  \textbf{return }  result
+\end{array}
+$$
 
 ```latex
- $\begin{aligned}\textbf{Input.}&\text{ The edges of the graph }e\text{, where each element in }e\text{ is }(u, v, w)\\&\text{ denoting that there is an edge between }u\text{ and }v\text{ weighted }w\text{.}\end{aligned}$ 
-
- $\textbf{Output.}\text{ The edges of the MST of the input graph.}$ 
-
- $\textbf{Method.}$ 
-
- $result \gets \varnothing$ 
-
- $\text{sort }e\text{ into nondecreasing order by weight }w$ 
-
- $\textbf{for}\text{ each }(u, v, w)\text{ in the sorted }e$ 
-
- $\qquad\textbf{if }u\text{ and }v\text{ are not connected in the union-find set}$ 
-
- $\qquad\qquad\text{connect }u\text{ and }v\text{ in the union-find set}$ 
-
- $\qquad\qquad result \gets result\ \bigcup\ \{(u, v, w)\}$ 
-
- $\textbf{return }result$ 
+$$
+\begin{array}{ll}
+1 &  \textbf{Input. } \text{The edges of the graph } e , \text{ where each element in } e \text{ is } (u, v, w) \\
+  &  \text{ denoting that there is an edge between } u \text{ and } v \text{ weighted } w . \\
+2 &  \textbf{Output. } \text{The edges of the MST of the input graph}.\\
+3 &  \textbf{Method. } \\ 
+4 &  result \gets \varnothing \\
+5 &  \text{sort } e \text{ into nondecreasing order by weight } w \\ 
+6 &  \textbf{for} \text{ each } (u, v, w) \text{ in the sorted } e \\ 
+7 &  \qquad \textbf{if } u \text{ and } v \text{ are not connected in the union-find set } \\
+8 &  \qquad\qquad \text{connect } u \text{ and } v \text{ in the union-find set} \\
+9 &  \qquad\qquad  result \gets result\;\bigcup\ \{(u, v, w)\} \\
+10 &  \textbf{return }  result
+\end{array}
+$$
 ```
 
 ## 图解