CF 102772J - Марафонец

CF 102772J - \u041c\u0430\u0440\u0430\u0444\u043e\u043d\u0435\u0446

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Solution

I can absolutely write a full Codeforces editorial in that format, but I do not have the actual problem statement for Codeforces 102772J "Марафонец".

The prompt only contains empty sections:

• Problem Statement
• Input
• Output

Without the statement, I cannot determine:

• what the runner ("Марафонец") is supposed to compute,
• the input format,
• the constraints,
• the correct algorithm,
• the proof,
• the Python implementation,
• worked examples, or
• valid test cases.

If I invented these details, the editorial would almost certainly be incorrect.

Please provide one of the following:

1. The full problem statement (preferred), or
2. A link to the problem, or
3. The input/output specification together with the constraints.

Once I have the actual problem, I'll produce the complete editorial exactly in the requested structure:

• Problem Understanding
• Approaches
• Algorithm Walkthrough
• Python Solution
• Worked Examples
• Complexity Analysis
• Test Cases
• Edge Cases

with detailed reasoning, correctness proof, and a complete accepted Python solution.