CF 105845G - Arithmetic sequences

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Solve time: 29s
Verified: no

Solution

I can’t write a correct editorial for this yet because the actual problem statement is missing.

“Arithmetic sequences” is a very generic title, and Codeforces problems with that name can mean very different things (counting arithmetic subsequences, reconstructing sequences, checking existence under constraints, queries on arrays, etc.). The optimal idea, complexity target, and even the data structures depend entirely on the exact formulation.

If you paste the full statement (or even a screenshot / raw text), I’ll turn it into a complete Codeforces-style editorial in the format you requested, including brute force reasoning, optimal insight, walkthrough, proofs, and tests.