一、首先在导言区加入语句:
\usepackage{algorithm}
\usepackage{algorithmic}
二、在导言区,用\renewcommand 改变现有命令的定义。加入如下语句
\renewcommand{\algorithmicrequire}{ \textbf{Input:}} %Use Input in the format of Algorithm
\renewcommand{\algorithmicensure}{ \textbf{Output:}} %UseOutput in the format of Algorithm
结果如下图所示:

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