{
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}
program Hello;
type
tRefKante = ^tKante;
tKante = record
von: integer;
zu: integer;
x:boolean;
next: tRefKante
end;
procedure push(inVon:integer; inZu:integer; var ioG:tRefKante);
var
n:tRefKante;
begin
new(n);
n^.von := inVon;
n^.zu := inZu;
n^.x := false;
n^.next := ioG;
ioG := n
end;
function get(inG:tRefKante; inVon:integer):tRefKante;
var
n:tRefKante;
begin
get := nil;
n := inG;
while (n <> nil) do
begin
if ((n^.von = inVon) and (not n^.x)) then
get := n;
n := n^.next;
end;
end;
function wasPassiert(inG:tRefKante; inVon:integer; inZu:integer):tRefKante;
var
akt:integer;
kante:tRefKante;
B:tRefKante;
begin
akt := inVon;
B := nil;
while ((akt <> inZu) and (akt <> 0)) do
begin
kante := get(inG,akt);
if (kante <> nil) then
begin
push(kante^.von,kante^.zu,B);
akt := kante^.zu;
kante^.x := true
end
else
begin
if (B <> nil) then
B := B^.next;
if (B = nil) then
akt := 0
else
akt := B^.zu
end;
end;
wasPassiert := B
end;
procedure print(inGraph:tRefKante);
var
e,f : tRefKante;
begin
e := inGraph;
while (e^.next <> nil) do
begin
e := e^.next;
end;
write('[',e^.von, ',', e^.zu,']');
while (e <> inGraph) do
begin
f := inGraph;
while (f^.next <> e) do
begin
f := f^.next
end;
write('[',f^.von, ',', f^.zu,']');
e := f
end;
end;
var A: tRefKante;
begin
push(8,9,A);
push(4,99,A);
push(8,10,A);
push(10,8,A);
push(4,10,A);
push(4,3,A);
push(3,4,A);
print(wasPassiert(A,3,99));
end.
