Thank you for your reply, the reason I would like to use array is as you said it is fast, however at the expense of eating memory. Also, for these undef elements, I may want to fill in something later.
So,what if I can only use array to implement, and Is there a method or package that can squash the memory occupied by "undef" in an array and return the the positions back when I try to fill something into the position that was occupied by a undef, sort of like autovivification?
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