I want to partition a list of positive numbers in sequential order so that sum of each partition will not be greater than a constant. for example, to partition sequentially the following list into sum of not greater than 30
   ]a=. 3+?.20#7
9 6 3 4 5 5 3 7 9 8 7 3 9 9 6 3 5 7 8 9

the index of cut can be found to be
    b=. 0 5 9 13 18
  (b e.~ i.#a) <;.1 a
+---------+-------+-------+---------+---+
|9 6 3 4 5|5 3 7 9|8 7 3 9|9 6 3 5 7|8 9|
+---------+-------+-------+---------+---+
   +/&> (b e.~ i.#a) <;.1 a
27 24 27 30 17

How to do it, preferably in tacit form?

--
regards,
bill
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