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Discussion of Problem 1220. Stacks

WA??
Posted by ufx 21 Apr 2003 05:24
program p1220;
type
  tstack=^pnode;
  pnode=record
    data:longint;
    next:tstack;
  end;

var
  s:array[1..1000] of tstack;
  sy:string[4];

procedure push(a,b:integer);
var
  p:tstack;
begin
  p:=s[a];
  while (p^.next<>nil) do
    p:=p^.next;
  new(p^.next);
  p:=p^.next;
  p^.data:=b;
  p^.next:=nil;
end;

procedure pop(a:integer);
var
  p,q:tstack;
begin
  p:=s[a]^.next;
  q:=s[a];
  while (p^.next<>nil) do begin p:=p^.next;q:=q^.next end;
  q^.next:=nil;
  writeln(p^.data);
  dispose(p);
end;

procedure init;
var i:integer;
begin
 for i:=1 to 1000 do begin
   new(s[i]);
   s[i]^.data:=-1;
   s[i]^.next:=nil;
 end;
end;

var
  i,n:longint;
  a,b:integer;
begin
  init;
  //assign(input,'in'); reset(input);
  readln(n);
  for i:=1 to n do begin
    read(sy);
    if sy='PUSH' then begin
       readln(a,b);
       push(a,b);
    end
    else begin
       readln(a);
       pop(a);
    end;
  end;
end.