How to draw several rectangles

Question

I want to draw 50 rectangles with height 3 & breadth 1. There should be space among these rectangles. Also I want to fill with blue color for rectangle number 1,5,7,10, 16, 22, with green color for 2, 14, 35, 44,46, others with red color.

Is there any easy way using \foreach statement in Tikz? Or is there any other easy way? I tried like this:

\begin{figure}[!htb]
    \centering 
    \scalebox{0.32}{
        \begin{tikzpicture}
            
        

    \foreach \x in {0, 1, ..., 50 }
          \draw (\x,0) rectangle (\x,10);
          %\draw [draw=black] (\x,4) rectangle (0.5,0);
          %\draw (\x,0) rectangle (0.5,4);

        %\draw [Stealth-Stealth, color = blue, thin] (\x, 0.3) -- (\x, 6.8);
        
        
            
    \end{tikzpicture}
    }
    \caption{}
    
\end{figure}

Answer 1

\documentclass[tikz, border=1cm]{standalone}
\begin{document}
\begin{tikzpicture}
\foreach \x in {1,...,50}
\fill[red] (1.1*\x,3) rectangle (1.1*\x+1,0);
\foreach \x in {1,5,7,10,16,22}
\fill[blue] (1.1*\x,3) rectangle (1.1*\x+1,0);
\foreach \x in {2,14,35,44,46}
\fill[green] (1.1*\x,3) rectangle (1.1*\x+1,0);
\end{tikzpicture}
\end{document}

Answer 2

Just for fun another version with a matrix and lists of colored cells.

\documentclass[tikz, border=1cm]{standalone}
\usetikzlibrary{matrix}

\begin{document}
\begin{tikzpicture}[
    mymatrix/.style={matrix of nodes, nodes in empty cells,
        nodes={fill=red, anchor=center, minimum width=3mm, minimum height=8mm, inner sep=0pt, outer sep=0pt},
        column sep=1pt,
        },
    bluecell/.style={column #1/.style={nodes={fill=blue}}},      
    greencell/.style={column #1/.style={nodes={fill=green}}},        
    ]
\matrix[mymatrix, bluecell/.list={1,5,7,10,16,22}, greencell/.list={2,14,35,44,46}]
    {&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&\\};
\end{tikzpicture}
\end{document}