Cannot reference algorithm

Question

For some reason referencing an algorithm displays always 0 instead of actual number of the algorithm. References work, I can click on it and it will move me to the algorithm.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{algpseudocode}
\usepackage{algorithm}
\usepackage{hyperref}

\begin{document}

\section{Introduction}
It doesn't work \ref{alg1} \ref{alg2}.

\begin{algorithm}
    \caption{Algorithm 1}
    \begin{algorithmic}[ht]
    \label{alg1}
        \State it's a test
    \end{algorithmic}
\end{algorithm}

\newpage

\begin{algorithm}
    \caption{Algorithm 2}
    \begin{algorithmic}[ht]
    \label{alg2}
        \State it's a test
    \end{algorithmic}
\end{algorithm}


\end{document}

piJT · Accepted Answer · 2023-03-01 13:26:07Z

\label goes directly after \caption:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{algpseudocode}
\usepackage{algorithm}
\usepackage{hyperref}

\begin{document}

\section{Introduction}
It doesn't work \ref{alg1} \ref{alg2}.

\begin{algorithm}
    \caption{Algorithm 1}
    \label{alg1}
    \begin{algorithmic}[ht]
        \State it's a test
    \end{algorithmic}
\end{algorithm}

\newpage

\begin{algorithm}
    \caption{Algorithm 2}
    \label{alg2}
    \begin{algorithmic}[ht]
        \State it's a test
    \end{algorithmic}
\end{algorithm}


\end{document}

cabohah · Accepted Answer · 2023-03-01 13:41:05Z

Place the \label immediately after \caption{…}:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{algpseudocode}
\usepackage{algorithm}
\usepackage{hyperref}

\newcommand*{\algorithmautorefname}{Algorithm}

\begin{document}

\section{Introduction}
It does work Algorithm~\ref{alg1} and \autoref{alg2}.

\begin{algorithm}
    \caption{Algorithm 1}
    \label{alg1}
    \begin{algorithmic}[ht]
        \State it's a test
    \end{algorithmic}
\end{algorithm}

\newpage

\begin{algorithm}
    \caption{Algorithm 2}
    \label{alg2}
    \begin{algorithmic}[ht]
        \State it's a test
    \end{algorithmic}
\end{algorithm}


\end{document}

In the example I've also shown, how to use \autoref with algorithm reference.

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