Cov txheej txheem:
Video: Dab tsi yog qhov ua tau zoo ntawm ib qho algorithm nyob ntawm?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Efficiency ntawm ib qho algorithm txhais tau tias sai npaum li cas nws tuaj yeem tsim qhov tseeb rau qhov teeb meem muab. Cov efficiency ntawm ib algorithm nyob ntawm nws lub sij hawm complexity thiab spacecomplexity. complexity ntawm ib algorithm yog ib txoj haujlwm uas muab lub sijhawm khiav thiab qhov chaw rau cov ntaub ntawv, nyob ntawm seb qhov loj npaum li cas los ntawm peb.
Yog li ntawd, dab tsi yog algorithm thiab nws efficiency?
algorithm efficiency Ib qho kev ntsuas ntawm tus nruab nrab execution lub sij hawm tsim nyog rau ib tug algorithm ua kom tiav kev ua haujlwm ntawm ib txheej ntawm cov ntaub ntawv. Algorithm efficiency ischaracterized los ntawm nws xaj. Feem ntau yog npuas hom algorithm yuav muaj efficiency nyob rau hauv sorting N khoomproportional rau thiab ntawm tus xaj n 2, feem ntau sau O(N 2).
Ib sab saum toj, dab tsi yog ob qho kev ntsuas tseem ceeb rau kev ua haujlwm ntawm ib qho algorithm? Algorithm Efficiency Feem ntau muaj tej yam ntuj tso units rau lub domain andrange ntawm no muaj nuj nqi. Muaj ob lub ntsiab nyuaj ntsuas ntawm efficiency ntawm ib tug algorithm : Timecomplexity yog ib txoj haujlwm piav qhia txog lub sijhawm algorithm yuav siv sij hawm nyob rau hauv cov nqe lus ntawm tus nqi ntawm input mus rau lub algorithm.
Kuj nug, peb tuaj yeem ntsuas qhov ua tau zoo ntawm cov algorithm li cas?
Algorithm Efficiency
- Lub sij hawm efficiency - ib qho kev ntsuas ntawm lub sij hawm rau ib tug algorithmto ua.
- Qhov chaw efficiency - ib qho kev ntsuas ntawm tus nqi ntawm lub cim xeeb xav tau rau lub algorithm los ua.
- Complexity txoj kev xav - kev kawm ntawm kev ua tau zoo algorithm.
- Function dominance - kev sib piv ntawm cov nqi zog.
Qhov programming efficiency yog dab tsi?
Code efficiency yog ib lo lus dav siv los piav txog kev ntseeg siab, ceev thiab programming methodology siv indeveloping codes rau ib daim ntawv thov. Code efficiency yog ncaj qha txuas nrog algorithmic efficiency thiab ceev ntawmruntime ua rau software. Nws yog lub hauv paus tseem ceeb hauv kev ua kom muaj kev ua haujlwm siab.
Pom zoo:
Qhov txawv ntawm qhov chaw nyob thiab qhov chaw nyob yog dab tsi?
Qee zaum, 'txoj kev chaw nyob' hais txog koj lub cev qhov chaw nyob ntawm qib zoo dua hauv nroog. Piv txwv li, '1313Mockingbird Lane', tsis muaj lub nroog lub npe txuas nrog. Tab sis yog, feem ntau nws tsuas yog ib daim ntawv rov qab kom paub qhov txawv ntawm qhov chaw xa ntawv (thaum chiv keeb) thiab tam sim no e-mail chaw nyob, chaw nyob hauv web, IPaddress, thiab lwm yam
Dab tsi yog qhov piv txwv ntawm qhov zoo nrog rau qhov zoo network sab nraud cuam tshuam?
Cov piv txwv classic yog xov tooj, qhov twg ntau tus neeg siv nce tus nqi rau txhua tus. Qhov zoo sab nraud yog tsim thaum lub xov tooj tau yuav yam tsis muaj nws tus tswv xav tsim kom muaj txiaj ntsig rau lwm tus neeg siv, tab sis ua li ntawd txawm tias
Qhov chaw nyob ntawm lub cev thiab qhov chaw nyob qhov chaw nyob yog dab tsi?
Qhov sib txawv yooj yim ntawm Logical thiab lub cev chaw nyob yog qhov chaw nyob Logical yog tsim los ntawm CPU hauv kev xav ntawm ib qho kev pab cuam. Ntawm qhov tod tes, qhov chaw nyob ntawm lub cev yog qhov chaw nyob uas muaj nyob hauv lub cim xeeb. Cov txheej txheem ntawm txhua qhov chaw nyob uas tsim los ntawm CPU fora program hu ua Logical Address Space
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Qhov txawv ntawm qhov chaw nyob sib txuas lus thiab qhov chaw nyob ruaj khov yog dab tsi?
Qhov chaw nyob xa ntawv yog chaw nyob sib txuas lus piv txwv li qhov koj nyob tam sim no. & chaw nyob Apermanent yog ntawm koj cov ntaub ntawv yog sau rau ntawm koj daim ntawv pov thawj hnub yug & daim npav pov npav. Qhov chaw nyob ruaj khov & kev sau ntawv yuav zoo ib yam lossis txawv ntawm cov ntaub ntawv siv tau