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This is my algorithm:

 \usepackage{graphicx}
 \usepackage[linesnumbered,ruled,vlined]{algorithm2e}
 \usepackage{algorithmicx}
 \usepackage{algpseudocode}
 %\usepackage{algorithmic}
 \usepackage{float}
 \begin{document}
 \begin{algorithm}
 \caption{Euclid's algorithm}\label{euclid}
 \begin{algorithmic}[1]
 \Procedure{Euclid}{$a,b$}
 \State $r\gets a\bmod b$
 \While{$r\not=0$}
 \State $a\gets b$
 \State $b\gets r$
 \State $r\gets a\bmod b$
 \EndWhile
 \State \textbf{return} $b$\Comment{The gcd is b}
%\EndProcedure
 \end{algorithmic}
 \end{algorithm}
 \end{document}

i have this error:

./llncs1.dem: 102: Missing number, treated as zero /EndWhile

Have you an idea please ?

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up vote 3 down vote accepted

You could simply do this:

\documentclass{article}
\usepackage{algorithm} %ctan.org\pkg\algorithms
\usepackage{algpseudocode}
\begin{document}

\begin{algorithm}
 \begin{algorithmic}[1]
 \Procedure{Euclid}{$a,b$}
 \State $r\gets a\bmod b$
 \While{$r\not=0$}
 \State $a\gets b$
 \State $b\gets r$
 \State $r\gets a\bmod b$
 \EndWhile
 \State \textbf{return} $b$ \Comment{The gcd is b}
 \EndProcedure
 \end{algorithmic}
 \caption{Euclid's algorithm}
 \label{euclid}
\end{algorithm}

\end{document}

Some packages define these kinds of floating environments, like alg, but that conflicted also.

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enter image description here

There are several packages for this type of layout, but you need to choose which to use, if you load them all you get conflicts, as you see. For example if you just used an algorithmicx based layout you could use:

 \documentclass{article}
 \usepackage{graphicx}
 %\usepackage[linesnumbered,ruled,vlined]{algorithm2e}
 %\usepackage{algorithmicx}
 \usepackage{algpseudocode}
 %\usepackage{algorithmic}
 \usepackage{float}
 \newfloat{algorithm}{tp}{toa}
 \begin{document}
 \begin{algorithm}
 \caption{Euclid's algorithm}\label{euclid}
 \begin{algorithmic}[1]
 \Procedure{Euclid}{$a,b$}
 \State $r\gets a\bmod b$
 \While{$r\not=0$}
 \State $a\gets b$
 \State $b\gets r$
 \State $r\gets a\bmod b$
 \EndWhile
 \State \textbf{return} $b$\Comment{The gcd is b}
 \EndProcedure
 \end{algorithmic}
 \end{algorithm}
 \end{document}
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