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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