NAME

RangeQuery - retrieves the minimum/maximum value from a sequence within a given range.

SYNOPSIS

    use RangeQuery qw(min_value max_value);

    my @sequence = (4,2,-8,6,-1,2);
    my $range = RangeQuery->new(@sequence);
    my $min = $range->min_value(0,2);   # -8
    my $max = $range->max_value (3, 5); # 6

DESCRIPTION

Retrieves the minimum/maximum value from a sequence within a given range. It takes O(n log n) to build the object and O(1) to retrieve a min/max value.

Note: You should use a more naive approach with small sequences of values.

METHODS

new

Creates a new RangeQuery object. This builds the appropriate data structure in order to retrieve values efficiently.

max_value

Retrieves the maximum value within a given range.

min_value

Retrieves the minimum value within a given range.

ToDo

Write this module in C.

SEE ALSO

You can check a tutorial from TopCoder, http://www.topcoder.com/tc?module=Static&d1=tutorials&d2=lowestCommonAncestor

AUTHOR

João Carreira, joao.carreira@ist.utl.pt

COPYRIGHT AND LICENSE

Copyright (C) 2009 by João Carreira

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available.