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Cod sursa(job #144998)
program permutari;
var A : array [1..8] of 1..8;
f,g : text;
n : integer;
function valid(p:integer):boolean;
var i,j : integer;
ok : boolean;
begin
ok := true;
for i := 1 to p do
for j := 1 to p do
if (A[i]=A[j]) and (i<>j) then begin
ok := false;
break;
end;
valid := ok;
end;
procedure back(p:integer);
var pval,i : integer;
begin
for pval := 1 to n do begin
A[p] := pval;
if valid(p) then if p=n then begin
for i := 1 to p do
write(g,A[i],' ');
writeln(g);
end
else back(p+1);
end;
end;
begin
assign(f,'permutari.in');
reset(f);
read(f,n);
assign(g,'permutari.out');
rewrite(g);
back(1);
close(f);
close(g);
end.