uses crt;
var a: array[1..1000] of integer;
i,k,n,t: integer;
begin
 clrscr;
 write ('nhap so luong phan tu: '); readln(n);
 for i:=1 to n do
  begin
   write ('nhap so thu ',i,': ');  readln (a[i]);
  end;
 for i:=1 to n-1 do
  for k:=i+1 to n do
  if (trunc(sqrt(a[i]))=sqrt(a[i])) and (trunc(sqrt(a[k]))=sqrt(a[k])) and (a[i]>a[k]) then
   begin
    t:=a[i];
    a[i]:=a[k];
    a[k]:=t;
   end;
 writeln ('cac phan tu sau khi duoc sap xep la: ');
 for i:=1 to n do
  write (a[i]:4);
 readln;
end.

uses crt;

var a: array[1..100] of integer;

i,n,j,t: integer;

begin

clrscr;

write ('nhap n: ');  readln (n);

for i:=1 to n do

begin

write ('a[',i,']=');  readln (a[i]);

end;

for i:=1 to n-1 do

for j:=i+1 to n do

if (a[i]>a[j]) and (trunc(sqrt(a[i]))=sqrt(a[i])) and (trunc(sqrt(a[j]))=sqrt(a[j])) then

begin

t:=a[i];

a[i]:=a[j];

a[j]:=t;

end;

writeln ('Mang sau khi sap xep: ');

for i:=1 to n do write (a[i]:4);

readln;

end.

$#Trumtinhoc$