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Odd Even Linked List — Two Chain In-Place
Group all odd-indexed nodes before even-indexed nodes in O(n) time and O(1) space using two pointer chains.
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Rotate List — Find Length and Reconnect
Rotate a linked list to the right by k places by finding length, computing effective rotation, and rewiring.
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Reorder List — Split, Reverse, Merge
Reorder a linked list into L0→Ln→L1→Ln-1 pattern by splitting at middle, reversing second half, then merging.
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Add Two Numbers — Simulate Carry with Dummy Head
Add two numbers represented as reversed linked lists by simulating digit addition with carry propagation.
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Add Two Numbers II — Stack to Handle Forward Order
Add two numbers given in forward order by pushing digits to stacks, then building the result list in reverse.
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