1 files changed, 24 insertions, 1 deletions
diff --git a/map.prolog b/map.prolog
index 84ec8c4..f5bb863 100644
--- a/map.prolog
+++ b/map.prolog
@@ -1,5 +1,10 @@
 
-:- module(map, [roomList/1, connects/3]).
+:- module(map, [roomList/1, isConnected/1, connects/3]).
+
+
+:- consult('misc.prolog').
+
+
 
 
 % map has 20 rooms, labelled a through t
@@ -11,6 +16,24 @@
 roomList(X) :- X = [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t].
 
 
+isConnected([]) :- true.
+isConnected(X) :-
+    head(Y,X),
+    tail(Z,X),
+    connectTail([Y],Z).
+
+connectTail(_,[]) :- true.
+connectTail([],_) :- false.
+connectTail(Open,G) :-
+    head(X,Open),
+    tail(Y,Open),
+    findall(N, connects(X,N,_), Ns),
+    subtract(G,Ns,Gx),
+    subtract(G,Gx,Nx),
+    append(Y,Nx,Yx),
+    connectTail(Yx,Gx).
+
+
 % loop around the middle
 
 connects(a,b,northeast).