\documentclass{scrartcl}
\RequirePackage{algorithm}
\RequirePackage{algorithmicx}
\RequirePackage[noEnd=false]{algpseudocodex}
\newcommand{\algorithmautorefname}{Algorithm} % Allow autoref.
% Define macros to typeset boolean in pseudocode environments
\algnewcommand{\True}{\textbf{\texttt{true}}}
\algnewcommand{\False}{\textbf{\texttt{false}}}
\algnewcommand{\NIL}{\textbf{\texttt{NIL}}}
\algnewcommand{\NULL}{\textbf{\texttt{null}}}
\input{definitions.tex}

\begin{document}

\end{document}