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� V �Qc @ sB d Z d Z d d d � � YZ d � Z e d k r> e � n d S( s� N 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. i t Queensc B sS e Z e d � Z d � Z d d � Z d � Z d � Z d � Z d Z d � Z RS( c C s | | _ | j � d S( N( t nt reset( t selfR ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyt __init__ s c C sf | j } d g | | _ d g | | _ d g d | d | _ d g d | d | _ d | _ d S( Ni i i ( R t Nonet yt rowt upt downt nfound( R R ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR s i c C s� x} t | j � D]l } | j | | � r | j | | � | d | j k rX | j � n | j | d � | j | | � q q Wd S( Ni ( t rangeR t safet placet displayt solvet remove( R t xR ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR s c C s0 | j | o/ | j | | o/ | j | | S( N( R R R ( R R R ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR & s c C s@ | | j | <d | j | <d | j | | <d | j | | <d S( Ni ( R R R R ( R R R ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR ) s c C s@ d | j | <d | j | <d | j | | <d | j | | <d S( Ni ( R R R R R ( R R R ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR / s c C s� | j d | _ | j r d Sd d | j d GHxb t | j d d d � D]G } d Gx5 t | j � D]$ } | j | | k r� d Gqe d Gqe Wd GHqK Wd d | j d GHd S( Ni s +-s --t +i����t |t Qt .( R t silentR R R ( R R R ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR 7 s ( t __name__t __module__t NR R R R R R R R ( ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyR s c C s� d d l } d } t } | j d d !d g k rD d } | j d =n | j d rg t | j d � } n t | � } | | _ | j � d G| j Gd GHd S( Ni����i i i s -nt Founds solutions.( t sysR t argvt intR R R R ( R R R t q( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyt mainF s t __main__N( ( t __doc__R R R R ( ( ( s+ /usr/lib64/python2.7/Demo/scripts/queens.pyt <module> s 8
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