£Á°èZ¨Ä…–K§‚«“ô4“ÒÙ´dîfUÙÃÅ WKbyʦ•êŽ…È®FÒ¿ÊÎóCozá¬S@6{Í:›œêZÌ:Š•_%:¢¾¾~;‘Ã~芩ÊǍí`ÔÑ©ú뙵'5I¿fš×WO%ø9¾«¾DK|€ùÍD”Ýs]nHÕ¶êםӼ㞪éUWŸÈË%DÒÕ¬ï‘]/Åcx ‰ï2ß]ä6G[]S£Ôϯrs{úëóµmÒï#UQxo·õÞCe]"±/aÙ&Eã4ú9Jé_ÞåëdãöKë)AÞ ¯¹ægƒÛowЍø^d™ý½ßB7áyMä9ÜÖUã !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  Afc@sBdZdZdddYZdZedkr>endS(sN queens problem. The (well-known) problem is due to Niklaus Wirth. This solution is inspired by Dijkstra (Structured Programming). It is a classic recursive backtracking approach. itQueenscBsSeZedZdZddZdZdZdZdZ dZ RS(cCs||_|jdS(N(tntreset(tselfR((s+/usr/lib64/python2.7/Demo/scripts/queens.pyt__init__s cCsf|j}dg||_dg||_dgd|d|_dgd|d|_d|_dS(Niii(RtNonetytrowtuptdowntnfound(RR((s+/usr/lib64/python2.7/Demo/scripts/queens.pyRs  icCsx}t|jD]l}|j||r|j|||d|jkrX|jn|j|d|j||qqWdS(Ni(trangeRtsafetplacetdisplaytsolvetremove(RtxR((s+/usr/lib64/python2.7/Demo/scripts/queens.pyRs cCs0|j| o/|j|| o/|j|| S(N(RRR (RRR((s+/usr/lib64/python2.7/Demo/scripts/queens.pyR &scCs@||j| s 8