Suppose l is a list and p, q, and r are positions. as a function of n, the length of list l, determine how many times the functions first, end, and next are executed by the following program. p : = first(l); while p < > end(l) do begin q : = p; while q < > end(l) do begin q : = next(q, l); r : = first(l); while r < > q do r : = next(r, l) end; p : = next(p, l) end;

Explanation:

  p := FIRST(L);

  while p <> END(L) do begin

      q := p;

      while q <> END(L) do begin

          q := NEXT(q, L);

          r := FIRST(L);

          while r <> q do

              r := NEXT(r, L)

      end;

      p := NEXT(p, L)

  end;

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