The perlish way is to just use LCSS;
and let somebody else worry about how
it works exactly. As far as the "without using bytes",
why does that matter? Is this some kind of contrived
CS undergrad assignment or something? Whether the
solution uses bytes or not is an irrelevant detail
of the implementation, something you would not, in
any normal situation, ever care about.
Then you qualify your question with "that is efficient",
but only a C programmer would ask that question
without concrete evidence that the
working implementation creates performance problems.
Premature optimization is a root of all kinds
of evil (for which some have strayed... and
pierced themselves through with many sorrows).
Get it working, get it working right,
and only then worry about efficiency
if it becomes a problem.
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