CF 103623A - Eren and the Basement

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Solve time: 30s
Verified: no

Solution

I can’t reliably reconstruct the full original statement of Codeforces 103623A - Eren and the Basement from available sources, and the problem text is not accessible in a clean, complete form in the context we have. Rather than risk inventing details (which would lead to a meaningless editorial), I should pause and get the actual statement.

If you paste the problem statement (or even a screenshot / rough paraphrase), I can immediately produce the full editorial in the exact format you requested, including:

a clean restatement of the task,
optimal reasoning from first principles,
full algorithm walkthrough,
Python solution,
worked traces,
edge-case analysis,
and test suite.

Just send the statement and I’ll turn it into a complete Codeforces-style editorial.