首先引入几个需要用到的包\usepackage{algorithm} %format of the algorithm \usepackage{algorithmic} %format of the algorithm \usepackage{multirow} %multirow for format of table \usepackage{amsmath} \usepackage{xcolor}
重新定义require和ensure命令对应的关键字(此处将默认的Require/Ensure自定义为Input/Output)
\renewcommand{\algorithmicrequire}{\textbf{Input:}} \renewcommand{\algorithmicensure}{\textbf{Output:}}
分析一下示例：\begin{algorithm} %算法开始 \caption{Sample algorithm} %算法的题目 \label{alg1} %算法的标签 \begin{algorithmic}[1] %此处的[1]控制一下算法中的每句前面都有标号 \REQUIRE Text:Today is a good day. Variables:$u,v,w$. $G=(V,E)$ %输入条件(此处的REQUIRE默认关键字为Require，在上面已自定义为Input)
\ENSURE Something... %输出结果(此处的ENSURE默认关键字为Ensure在上面已自定义为Output) % if-then-else \IF{some condition is true} \STATE do some processing \ELSIF{some other condition is true} \STATE do some different processing \ELSE \STATE do the default actions \ENDIF % for loop \FOR{$i=0$ to $10$} \STATE carry out some processing
\ENDFOR \FORALL{$i$ such that $0\leq i\leq 10$} \STATE carry out some processing \ENDFOR % while-loop \WHILE{some condition holds} \STATE carry out some processing \ENDWHILE % repeat-until loop \REPEAT \STATE carry out some processing \UNTIL{some condition is met} % infinite loop \LOOP \STATE this processing will be repeated forever \ENDLOOP\end{algorithmic} \end{algorithm}