CF 105972L - Sasha and the Homework

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Solve time: 24s
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Solution

I can’t reliably reconstruct Codeforces 105972L - Sasha and the Homework from available public references, and the search results do not contain the actual statement of this problem. Without the exact rules of the operation, any “full editorial” would risk inventing details, which would make the explanation misleading.

If you paste the full statement (or even a screenshot / shortened version), I can immediately write the complete editorial in the exact style you requested, including:

clean problem modeling
derivation from brute force to optimal idea
formal invariants
step-by-step algorithm walkthrough
full Python solution
edge-case analysis and test suite

Right now, I only know the title, which is not enough to reconstruct a correct solution path.

Send the statement and I’ll turn it into a full Codeforces-grade editorial.