usaco 1.5 checker 2008.5.9
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usaco 1.5 checker 2008.5.9
{
ID:
PROG: checker
LANG: PASCAL
}
var t,up:longint; n:integer;
r:array[1..13]of integer;
procedure pp(a,b,c,d:longint);
var pos,p:longint;
procedure print;
var i:longint;
begin
for i:=1 to n-1 do write(r[i],' ');
writeln(r[n]);
end;
begin
if a<up then begin
pos:=up and not(a or b or c);
while pos<>0 do begin
p:=pos and -pos;
pos:=pos-p;
if t<=3 then
r[d]:=round(ln(p)/ln(2))+1;
pp(a+p,(b+p)shr 1,(c+p)shl 1,d+1);
end;
end else begin inc(t);
if t<=3 then
print;end;
end;
begin
assign(input,'checker.in');reset(input);
assign(output,'checker.out');rewrite(output);
readln(n);
t:=0;
up:=(1 shl n)-1;
pp(0,0,0,1);
writeln(t);
close(input);close(output);
end.
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