Interleave Clones
Each copy is inserted directly after its original so original-to-copy lookup is local.
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Clone With Random Pointer duplicates a list where every node has next and random links, without losing the original relationship graph.
Each copy is inserted directly after its original so original-to-copy lookup is local.
A clone's random pointer becomes original.random.next.
The final pass restores originals and extracts the clone list.
Interleaving avoids O(n) auxiliary map storage.