\Begin{algorithm} notes

\begin{algorithm}
\caption{A}
\label{alg:A}
\begin{algorithmic}
\STATE {set $r(t)=x(t)$} 
\REPEAT 
\STATE set $h(t)=r(t)$ 
\REPEAT
\STATE set $h(t)=r(t)$ 
\UNTIL{B} 
\UNTIL{B}
\end{algorithmic}
\end{algorithm}