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Problem based on lists operations

Python/Codingeasy0.5 min readPremium
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Asked at 1 company
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McKinsey
Expert AnswerPremium
100 wordsInterview-ready
**Why List Semantics Matter:** lst += [x] mutates in-place; lst = lst + [x] creates new list—affects performance and shared references. In pipelines, unintended mutation causes subtle bugs. **Operations & Complexity:** append O(1) amortized; insert(0, x) O(n); extend O(k); in O(n). For repeated prepend: use collections.deque (O(1) appendleft). For sorted insert: bisect.insort O(n). **Production Gotcha:** Never modify a list while iterating—use [x for x in lst if cond] or iterate over lst[:]....
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