Isinyathelo 17 · Okwengcweti
Innie-Outie (umehluko wangaphakathi nangaphandle): liyini leli qhinga? Indlela yokuxazulula i-Killer Sudoku
Isinyathelo esingaphezu komthetho wama-45: lithola umehluko phakathi kwesikwele esishodayo ngaphakathi komugqa, ikholomu noma ibhokisi nesikwele esiphumela ngaphandle, okunciphisa zombili izinombolo.
Liyini leli qhinga
Isinyathelo esingaphezu komthetho wama-45. Esambeni somugqa, sekholomu noma sebhokisi, susa izibaya ezingaphakathi nezibaya eziphumela ngaphandle zizonke.
Okusalayo ngumehluko phakathi kwezikwele ezishodayo ngaphakathi nezikwele eziphumela ngaphandle. Uma kuyisikwele esisodwa ohlangothini ngalunye, uyazi ukuthi esinye sikhulu kangakanani kunesinye.
Isibonelo: uma umehluko ungu-2, isikwele sangaphakathi sikhulu ngo-2 kunesangaphandle. Uma esangaphandle singaba ngu-1–3, esangaphakathi kufanele sibe ngu-3–5.
Ungalibona kanjani
Kusebenzise lapho umthetho wama-45 ushiya isikwele esisodwa ngaphakathi nesisodwa ngaphandle, futhi izamba zazo ungakwazi ukuzibala ngokwehlukana. Engeza izibaya eziphumela ngaphandle zizonke bese ubala ukuthi yiziphi izikwele ezishodayo neziphi ezengeziwe.
Isibonelo
Izindawo ezizungezwe ulayini wamachashazi yizibaya, isamba sisekhoneni eliphezulu kwesokunxele. Izikwele eziphuzi zikhombisa ukuthi ubheke kuphi, ezisawolintshi ziyisizathu, izinombolo ezibomvu yizinombolo ezingenzeka ongazisusa, kanti inombolo eluhlaza okotshani iyimpendulo.
Izinombolo ebhokisini 5 zinesamba esingu-45. Thatha izibaya ezingaphakathi ngokuphelele (isamba esingu-17) bese wengeza izibaya eziphumela ngaphandle zizonke (isibaya esingu-17 ku-M3K5, isamba esingu-17): lokho kushiya izikwele M5K4, M5K6 no-M6K6 ngaphakathi endaweni, futhi kufake isikwele M3K5 ngaphandle kwayo. Ngakho (M5K4, M5K6 no-M6K6) − (M3K5) = 45 − 17 − 17 = 11. Uma ususa izinombolo esezifakiwe, M5K4 − M3K5 = 7. Ngakho isikwele M5K4 sikhulu ngo-7 kunesikwele M3K5. Izinombolo ezingenamlingani esikweleni esinye (2, 3, 4, 5, 6, 7, 8 no-9) angeke zingene ezikweleni M5K4 no-M3K5.