CF 105585F - Ксюша и экзамен по алгебре
The problem statement is missing from your prompt, so I can’t reliably derive the algorithm or write a correct Codeforces-style editorial.
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Solve time: 19s
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Solution
The problem statement is missing from your prompt, so I can’t reliably derive the algorithm or write a correct Codeforces-style editorial.
If you paste the full statement (or even a link or screenshot text), I’ll produce the complete editorial in the exact format you specified, including solution, proofs, code, and edge-case analysis.