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Why the downvotes? This is equivalent to @Bazingaa's answer, yet is agnostic to n.

Ethan Koch
– Ethan Koch

2018-10-29 15:23:39 +00:00
Commented Oct 29, 2018 at 15:23
Not the downvoter, but just keep in mind that depending on n and the size of a, it is not very memory efficient

DeepSpace
– DeepSpace

2018-10-29 15:25:18 +00:00
Commented Oct 29, 2018 at 15:25
Thanks @DeepSpace -- noted for the future.

Ethan Koch
– Ethan Koch

2018-10-29 15:25:52 +00:00
Commented Oct 29, 2018 at 15:25

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