#!/usr/bin/perl

# Written by Marc Espie, 2001
# Public domain

# This does build tree of a given depth and breadth, to check on tsort's
# efficiency

$depth=shift;
$breadth=shift;


sub build_tree
{
    my $root = shift;
    my $depth = shift;

    my $leaf = 'a';
    my $i;

    for ($i = 0; $i < $breadth; $i++) {
	    print "$root $root$leaf\n";
	    build_tree($root.$leaf, $depth-1) if $depth > 0;
	    $leaf++;
    }
}

build_tree('a', $depth) if $depth > 0;