Hello monks,
Someone sent me a link to www.interviewstreet.com and i tried one of those challenges called: Find strings for fun. I have submitted a working code but after 3 tests it fails with "Out of Memory"
I have tried a few attempts without real improvement, it gets a bit faster but still fails. Maybe you can have a look at it and let me know which parts can be improved.
TIA
Inputs:
2
aab
aac
3
3
8
24
Output:
aab
c
INVALID
#!/usr/bin/perl
use strict;
use warnings;
$| = 1; # flush output
# Get inputs
my $n = 0; # number of strings
chomp( $n = <STDIN> );
my $i = 0; # line counter
my $w = ''; # input string
my @S = (); # uniq strings from inputs
while ( $i++ < $n )
{
chomp ( $w = <STDIN> );
push @S, get_uniq_strings( $w );
}
# Get the queries
my $q = 0;
chomp( $q = <STDIN> );
$i = 0;
my $k = '';
my @queries = ();
while ( $i++ < $q )
{
chomp( $k = <STDIN> );
push @queries, $k - 1;
}
# Output
@S = make_uniq( \@S );
my $uniq_len = scalar @S;
foreach ( @queries )
{
print (( $_ <= $uniq_len ) ? "$S[ $_ ]\n" : "INVALID\n" );
}
exit;
sub get_uniq_strings
{
my $string = shift;
my @a = ();
my $len = length $string;
for ( my $i = 1; $i <= $len; $i++ )
{
for ( my $offset = 0; $offset < $len - $i + 1; $offset++ )
{
my $sub_str = substr $string, $offset, $i;
push @a, $sub_str if $sub_str;
}
}
@a;
}
sub make_uniq
{
my $str_array = shift;
my $uniq_array = {};
foreach( @{ $str_array } )
{
$uniq_array->{ $_ }++ if $_;
}
sort keys %{ $uniq_array };
}
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