public class MatrixImpl implements Matrix $\{$

private int$[][]$ edges;

public MatrixImpl$($int$[][]$ edges$)\{$

this.edges $=$ edges;

$\}$

@Override

public int getNumVertices$()\{$

return edges.length;

$\}$

@Override

public int getEdge$($int i$,$ int j$)\{$

return edges$[$i$][$j$]$;

$\}$

$\}$