CF 102964D - Krosh and series sum

I’m missing the actual statement of Codeforces 102964D - Krosh and series sum in your prompt (it’s blank under “Problem Statement”).

codeforcescompetitive-programming

CF 102964D - Krosh and series sum

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Solve time: 28s
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Solution

I’m missing the actual statement of Codeforces 102964D - Krosh and series sum in your prompt (it’s blank under “Problem Statement”).

Since the editorial depends heavily on the exact definition of the “series sum” Krosh is working with, any attempt to proceed without it would risk inventing a different problem entirely, which would make the walkthrough misleading.

If you paste the statement (or even just the key definition of the series and constraints), I’ll immediately produce a full Codeforces-style editorial in the format you specified, including the derivation, walkthrough, complexity analysis, and tests.