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var a : array[1..6] of longi

[填空题]
var
  a : array[1..6] of longint = (1, 2, 3, 4, 5, 6);
  pi, pj, t, i : longint;
begin
  pi := 1;
  pj := 6;
  while pi < pj do
  begin
    t := a[pi];
    a[pi] := a[pj];
    a[pj] := t;
    inc(pi);
    dec(pj);
  end;
  for i := 1 to 6 do
    write(a[i], ',');
  writeln;
end.
输出:1

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