Qhov Parameterized Complexity ntawm qee Pawg Permutation Permutation Group Hauv kev lej, ib pawg permutation yog ib pawg group G uas nws cov ntsiab lus yog permutations ntawm qhov muab M thiab nws pab pawg ua haujlwm yog qhov muaj pes tsawg leeg ntawm permutations hauv G(uas yog xav tias yog bijective functions los ntawm teeb M rau nws tus kheej). … Lub sij hawm permutation pab pawg li no txhais tau hais tias ib pab pawg ntawm cov pab pawg symmetric. https://en.wikipedia.org › wiki › Permutation_group
Permutation group - Wikipedia
Teeb meem. Hauv daim ntawv no peb kawm txog qhov tsis sib haum xeeb ntawm ob qhov kev paub zoo ntawm pawg teeb meem uas yog NP-ua tiav.
Puas yog lub sijhawm permutation polynomial?
permutations yuav siv sijhawm polynomial lub sijhawm dhau los i.e. nws yuav ua rau hauv s(n)=O(n!
Cov teeb meem twg yog NP-ua tiav?
NP-ua tiav qhov teeb meem, ib qho ntawm chav kawm ntawm cov teeb meem kev suav daws uas tsis muaj kev daws teeb meem zoo tau pomNtau qhov teeb meem tseem ceeb hauv computer-science muaj nyob rau hauv chav kawm no-piv txwv li, cov Teeb meem tus neeg muag khoom mus ncig, teeb meem txaus siab, thiab teeb meem npog.
Puas sorting teeb meem NP-ua tiav?
Sorting Numbers
Muab ib daim ntawv teev cov lej, koj tuaj yeem tshawb xyuas seb cov npe puas raug txheeb lossis tsis nyob hauv lub sijhawm ntau, yog li qhov teeb meem yog meej NP. Muaj cov algorithms paub los txheeb cov npe ntawm cov lej hauv lub sijhawm polynomial. (Npuas txheeb O(n^2) thiab lwm yam).
Puas NP sib npaug rau NP-complete?
Dab tsi yog qhov kev faib ob yog qhov zoo ib yam? Hauv lwm lo lus, yog tias peb muaj qhov teeb meem NP ces dhau ntawm (2) qhov teeb meem no tuaj yeem hloov mus rau NP-tiav teeb meem. Yog li ntawd, qhov teeb meem NP tam sim no NP-ua tiav, thiab NP=NP- tiavOb chav kawm sib npaug.
