CF 103379I - Santa's Last Journey

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Solve time: 29s
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Solution

The problem statement for Codeforces 103379I - Santa's Last Journey is missing from your prompt (the “Problem Statement”, “Input”, and “Output” sections are empty). Without the actual rules of the problem, any editorial would be guesswork, and that would defeat the goal of a correct, reusable derivation.

If you paste the full statement (even a screenshot or raw text), I can immediately produce a complete Codeforces-style editorial in the exact format you specified, including the algorithm walkthrough, proof sketch, and full Python solution.

Send the statement and I’ll continue from there.