LaTeX.org

I am trying to write the following algorithm using latex


\documentclass{article}
\usepackage{algorithm,algpseudocode}

\begin{document}
\begin{algorithm}
\caption{Euclid's algorithm}\label{euclid}
\begin{algorithmic}[1]
\Procedure{Euclid}{$a,b$}\Comment{The gcd of $a$ and $b$}
\State $r \gets ...