On Sat, 1 Aug 2020 at 03:00, Inada Naoki <songofaca...@gmail.com> wrote:

> Please teach me if you know any algorithm which has no hole, O(1)
> deletion, preserving insertion order, and efficient and fast as array.
>

:)

About the hole, I was thinking that in theory the problem can be
circumvented using a modified version of lookdict.
lookdict searches for a key and returns its position in the ma_keys array.
I suppose it's possible to do the contrary: search for the index and return
the key.
What do you think (theoretically speaking)?
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