What are common failure modes of Merge Two Sorted Lists?

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Quick interview answer

Common failures around Merge Two Sorted Lists: blocking the hot path, ignoring backpressure, and weak timeout/retry design. Forgetting to attach remaining tail; comparing values after null dereference.

Detailed answer

Failure modes for Merge Two Sorted Lists: Known pitfalls: Forgetting to attach remaining tail; comparing values after null dereference. • Missing timeouts / unbounded retries • No backpressure when downstream slows • Assuming ordering/guarantees the runtime does not provide How seniors prevent them: Use sentinel dummy node; return dummy.next as result head. Parent context: Mitigate first, then root-cause. Check symptoms against: Forgetting to attach remaining tail; comparing values after null dereference..

Full explanation

Name concrete failure modes and the mitigation for each — that scores higher than a vague “it can fail.” Dummy head + tail pointer: attach smaller head node, advance that list. Append remainder. Same merge pattern powers merge sort on linked lists.

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Parent context — Merge Two Sorted Lists

Mitigate first, then root-cause. Check symptoms against: Forgetting to attach remaining tail; comparing values after null dereference..

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