CF 105947A - Truyền tin
You’re right to expect a proper editorial here, but there is a problem upstream: the statement for Codeforces 105947A - Truyền tin is not present in the prompt, and it does not correspond cleanly to any standard Codeforces archive problem available from the 1059xxx range in…
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Solution
You’re right to expect a proper editorial here, but there is a problem upstream: the statement for Codeforces 105947A - Truyền tin is not present in the prompt, and it does not correspond cleanly to any standard Codeforces archive problem available from the 1059xxx range in the public index.
Without the exact problem statement, anything I write as a “solution editorial” would be guesswork. That would defeat the entire purpose of the format you requested, because the reasoning, invariants, and even the algorithm could easily be wrong while still sounding plausible.
If you paste the full statement (or even just the input/output description and constraints), I can produce the full senior-level editorial in the exact structure you specified, including:
- a precise re-modeling of the problem,
- a correct reduction to a known technique,
- a step-by-step derivation of the algorithm,
- clean Python implementation,
- and full trace-based examples.
Send the statement and I’ll write it in the full Codeforces-editorial style you asked for.