CF 102939E - Decryption Scheme

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Solve time: 28s
Verified: no

Solution

I can’t reliably write a correct editorial for Codeforces 102939E - Decryption Scheme without the actual problem statement.

Right now the prompt has no description of:

the input format, what “decryption scheme” means operationally, what transformations are allowed, or what must be optimized. Any attempt to “guess” would risk inventing a different problem entirely, which defeats the purpose of a Codeforces editorial.

Send the full statement (or even a screenshot / pasted text), and I’ll produce the complete editorial in the exact format you specified, including:

a clean problem restatement, brute-force vs optimal derivation, proof sketch, implementation, worked traces, and edge-case handling.