Just a few comments (since I don't really know what algorithm you are trying to implement). First consider using using strict and warnings. And next, on this line:
for(my $i=$m;$i<scalar @a;$i++)

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A more "perlish" way of doing that sort of thing is:
for my $i ($m..$#a)

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And this:
while (($key1, $val1) = each(%num))
{
push(@key,$key1);
push(@val,$val1);
}
}

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Is easier done like this (and they will be in the correct corresponding order):
my @key = keys %num;
my @val = values %num;

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In reply to Re: Guidance needed in perl program for fast pattern matching algorithm. by runrig
in thread Guidance needed in perl program for fast pattern matching algorithm. by tweety

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