Found one explanation here
http://www2.toki.or.id/book/AlgDesignManual/BOOK/BOOK2/NODE45.HTM

But one of the statements there is not acceptable to me.
"However, such heuristic methods are doomed to fail on certain inputs,
because they do not systematically evaluate all possibilities."

I just could not come up with any such sequence where the heuristic
method would fail.
Can anyone give me an example to that?

Also, its said that the problem can be used in task scheduling by
multiple processors. When the order of tasks is maintained, how will
its use serve the purpose of parallel execution?


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