How does Velaki's solution use more memory (except maybe for (@a), which could be replaced with for ($j=0; $j<@a; $j++))?

Update: Ah yes, you return an interator instead of building an actual list.

In reply to Re^3: Generating 0 .. N Randomly and Efficiently by ikegami
in thread Generating 0 .. N Randomly and Efficiently by Limbic~Region

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