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Discussion of Problem 1229. Strong Brickwork

why i get WA?? who can help me??
Posted by Zhang Ruiwen 20 Nov 2002 15:21
var a,b:array[1..100,1..100] of char;
    ans:array[1..100,1..100] of integer;
    m,n,i,j,top:integer;

procedure init;
var aa:array[1..100,1..100] of integer;
begin
 fillchar(a,sizeof(a),' ');
 readln(n,m);
 for i:=1 to n do
  for j:=1 to m do read(aa[i,j]);
 for i:=1 to n do
  for j:=1 to m do
  if a[i,j]=' ' then
  begin
   if a[i,j+1]=a[i,j] then
   begin
    a[i,j]:='l';
    a[i,j+1]:='r';
   end else
   begin
    a[i,j]:='u';
    a[i+1,j]:='b';
   end;
  end;
 top:=0;
 fillchar(b,sizeof(b),' ');
end;

procedure print;
var i,j:integer;
begin
 for i:=1 to n do
 begin
  for j:=1 to m do write(ans[i,j],' ');
  writeln;
 end;
end;

function can(u,v,i:integer):boolean;
begin
 if i=1 then
 begin
  if (a[u,v]<>'l')and(v+1<=m) then can:=true
                              else can:=false;
 end else
 begin
  if (a[u,v]<>'u')and(u+1<=n) then can:=true
                              else can:=false;
 end;
end;

procedure work(u,v:integer);
var i:integer;
begin
 if (u=n+1)and(v=1) then begin print; halt; end;
 if b[u,v]=' ' then
 begin
  for i:=1 to 2 do
  if can(u,v,i) then
  begin
   inc(top);
   if i=1 then
   begin
    b[u,v]:='l';
    b[u,v+1]:='r';
    ans[u,v]:=top;
    ans[u,v+1]:=top;
   end else
   begin
    b[u,v]:='u';
    b[u+1,v]:='b';
    ans[u,v]:=top;
    ans[u+1,v]:=top;
   end;
   if v+1<=m then work(u,v+1)
             else work(u+1,1);
   if i=1 then
   begin
    b[u,v]:=' ';
    b[u,v+1]:=' ';
   end else
   begin
    b[u,v]:=' ';
    b[u+1,v]:=' ';
   end;
  end;
 end else
   if v+1<=m then work(u,v+1)
             else work(u+1,1);

end;

begin
 init;
 work(1,1);
 writeln(-1);
end.