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#!/usr/bin/env perl
use Tree::Binary;
use Modern::Perl;
use List::Util 'max';
=begin example1
1
/ \
2 5
/ \ / \
3 4 6 7
/ \
8 10
/
9
=end example1
=cut
my $example1 = Tree::Binary->new('1')
->setLeft(Tree::Binary->new('2')
->setLeft(Tree::Binary->new('3'))
->setRight(Tree::Binary->new('4')))
->setRight(Tree::Binary->new('5')
->setLeft(Tree::Binary->new('6'))
->setRight(Tree::Binary->new('7')
->setLeft(Tree::Binary->new('8')
->setLeft(Tree::Binary->new('9')))
->setRight(Tree::Binary->new('10'))));
say treeDiameter($example1); # 6
sub treeDiameter
{
my $btree = shift;
my @diameters;
$btree->traverse
(
sub
{
my ($tree) = @_;
my $leftHeight = 0;
my $rightHeight = 0;
if ($tree->hasLeft)
{
$leftHeight = $tree->getLeft->height;
}
if ($tree->hasRight)
{
$rightHeight = $tree->getRight->height;
}
push @diameters, $leftHeight + $rightHeight;
}
);
max @diameters;
}
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