From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: a07f3367d7,a9916530bf157e77 X-Google-Attributes: gida07f3367d7,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII-7-bit X-Received: by 10.224.88.200 with SMTP id b8mr42087251qam.8.1367268946563; Mon, 29 Apr 2013 13:55:46 -0700 (PDT) X-Received: by 10.49.40.168 with SMTP id y8mr806700qek.9.1367268946537; Mon, 29 Apr 2013 13:55:46 -0700 (PDT) Path: ef9ni28916qab.0!nntp.google.com!s14no921964qam.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Mon, 29 Apr 2013 13:55:46 -0700 (PDT) In-Reply-To: <61f44636-ad71-447f-a20e-473e613f63ff@googlegroups.com> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=134.240.138.199; posting-account=CZZpzgoAAAAoaHoNNp9zhY9EzQgEmxhU NNTP-Posting-Host: 134.240.138.199 References: <87c89205-7fee-4d88-b4ab-08d26c03219b@googlegroups.com> <99d9a17c-ed8d-4c28-90d0-6543b511cb87@googlegroups.com> <4c3eca49-8ee6-4518-9968-879c08b828f6@googlegroups.com> <61f44636-ad71-447f-a20e-473e613f63ff@googlegroups.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <5d751787-2574-475c-befc-553fcd02e6b6@googlegroups.com> Subject: Re: Depth First Search of a Char_Matrix? From: Alex Injection-Date: Mon, 29 Apr 2013 20:55:46 +0000 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Date: 2013-04-29T13:55:46-07:00 List-Id: On Saturday, April 27, 2013 7:34:51 PM UTC-4, Shark8 wrote: > When you print the array out you have a representation of nodes (and impl= icitly edges), just displayed in a tabular ASCII format. >=20 >=20 >=20 > Is a very real sense (1,1), (1,2),...,(5,5) are merely addresses/location= s of a node, wherein 'B', 'W' and '.'/' ' denote that node's state the edge= s, then, ar nothing more than the relationship of what is adjacent in the h= orizontal/vertical. >=20 >=20 >=20 > ------------------------------------------- >=20 > [Non-DFS method] >=20 > You could count the dead pieces as follows: >=20 > if there are no empty locations all are dead, otherwise >=20 > (1) make two lists of nodes A & B, >=20 > (2) add all the empty nodes to A, >=20 > (3) for each node of A, add its neighbors to B if they are occupied, >=20 > (4) clear A >=20 > (5) for each of those nodes in B, add only its neighbors containing a pie= ce of the same color to A >=20 > (6) merge A into B >=20 > (7) repeat #4/#5/#6 until the sizes B is the same as it was in #4. >=20 >=20 >=20 > At this point the system is stable and you have all the live pieces in yo= ur list, anything not in your list is then dead. -- This would be a horribl= e way to do things on any large sized board because of the reiterations... = but it's already given you the secret of how to do it with DFS. This is what I have so far but I am going out of Bounds and I am not sure w= hy?? function Count_Alive(Board : Char_Matrix) return Integer is M : Char_Matrix :=3D Board;=20 V : Bool_Matrix(2..Board'Length-1, 2..Board'Length-1) :=3D (others =3D> (o= thers =3D> False));=09 WhiteCount, BlackCount : Integer :=3D 0; procedure DFS(X,Y:Integer; Char : Character) is current : Character:=3D Char;=09 begin Put_Line("X =3D " & X & " Y =3D " & Y); if V(X,Y) =3D True or M(X,Y) =3D '/' or M(X,Y) /=3D current then null; else V(X,Y) :=3D True; if current =3D 'W' then WhiteCount :=3D WhiteCount + 1; end if; =09 if current =3D 'B' then BlackCount :=3D BlackCount + 1; end if; end if; =09 DFS(X,Y-1,current); DFS(X+1,Y,current); DFS(X-1,Y,current); DFS(X,Y+1,current); =09 end DFS; begin for R in 2..M'Length(1)-1 loop for C in 2..M'Length(2)-1 loop if M(R,C) =3D '.' then DFS(R,C-1,'W'); DFS(R+1,C,'W'); DFS(R-1,C,'W'); DFS(R,C+1,'W'); =09 DFS(R,C-1,'B'); DFS(R+1,C,'B'); DFS(R-1,C,'B'); DFS(R,C+1,'B'); end if; end loop; end loop; return (1000*BlackCount)+WhiteCount; end Count_Alive;