NAME

Algorithm::Treap - randomized search tree

SYNOPSIS

use Algorithm::Treap;

# store Int key
my $treap = Algorithm::Treap[Int].new;
$treap.insert(0, 0);
$treap.insert(1, 10);
$treap.insert(2, 20);
$treap.insert(3, 30);
$treap.insert(4, 40);
my $value = $treap.find-value(3); # 30
my $first-key = $treap.find-first-key(); # 0
my $last-key = $treap.find-last-key(); # 4

# delete
$treap.delete(4);

# store Str key
my $treap = Algorithm::Treap[Str].new;
$treap.insert('a', 0);
$treap.insert('b', 10);
$treap.insert('c', 20);
$treap.insert('d', 30);
$treap.insert('e', 40);
my $value = $treap.find-value('a'); # 0
my $first-key = $treap.find-first-key(); # 'a'
my $last-key = $treap.find-last-key(); # 'e'

# delete
$treap.delete('c');

DESCRIPTION

Algorithm::Treap is a implementation of the Treap algorithm. Treap is the one of the self-balancing binary search tree. It employs a randomized strategy for maintaining balance.

CONSTRUCTOR

new

my $treap = Algorithm::Treap[::KeyT].new(%options);

Sets either one of the type objects(Int or Str) for ::KeyT and some %options, where ::KeyT is a type of insertion items to the treap.

OPTIONS

order-by => TOrder::ASC|TOrder::DESC

Sets key order TOrder::ASC or TOrder::DESC in the treap. Default is TOrder::ASC.

METHODS

insert

$treap.insert($key, $value);

Inserts the key-value pair to the treap. If the treap already has the same key, it overwrites existing one.

delete

$treap.delete($key);

Deletes the node associated with the key from the treap.

find-value

my $value = $treap.find-value($key);

Returns the value associated with the key in the treap. When it doesn't hit any keys, it returns type object Any.

find

my $node = $treap.find($key);

Returns the instance of the Algorithm::Treap::Node associated with the key in the treap. When it doesn't hit any keys, it returns type object Any.

find-first-key

my $first-key = $treap.find-first-key();

Returns the first key in the treap.

find-last-key

my $last-key = $treap.find-last-key();

Returns the last key in the treap.

METHODS NOT YET IMPLEMENTED

join, split, finger-search, sort

AUTHOR

titsuki titsuki@cpan.org

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.

The algorithm is from Seidel, Raimund, and Cecilia R. Aragon. "Randomized search trees." Algorithmica 16.4-5 (1996): 464-497.