参考Algorithm2e - Disabling line numbers for specific lines - TeX - LaTeX Stack Exchange

在algorithm块中添加命令

	\newcommand{\nonl}{\renewcommand{\nl}{\let\nl\oldnl}}% Remove line number for one line
	\nonl\BinToDOne{in, out}\\

之后在想要取消行号的地方添加\nonl在那一行前面就可以了

效果

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{algorithm}
    \caption{Arithmetics Operations in Diminished-1}
    \label{algo_D1}
	\SetKwInOut{Input}{Input}\SetKwInOut{Output}{Output}
	\SetKwFunction{MultByK}{Multiplication\_by\_kPowerOf2}

	\let\oldnl\nl% Store \nl in \oldnl
	\newcommand{\nonl}{\renewcommand{\nl}{\let\nl\oldnl}}% Remove line number for one line
	
	\nonl\MultByK{k, in, out}\\
	{
		\setcounter{AlgoLine}{0}
		....\\
		.....\\
		....\\
		
	}
	\nonl\MultByK{k, in, out}\\
	{
		\setcounter{AlgoLine}{0}
		....\\
		.....\\
		....\\
		
	}
	
	\end{algorithm}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%