CF 102551D - Доставка почты

I can write the editorial, but the problem statement for Codeforces 102551D “Доставка почты” is missing from the prompt.

codeforcescompetitive-programming

CF 102551D - \u0414\u043e\u0441\u0442\u0430\u0432\u043a\u0430 \u043f\u043e\u0447\u0442\u044b

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Solution

I can write the editorial, but the problem statement for Codeforces 102551D “Доставка почты” is missing from the prompt. I do not have enough information to determine the graph/array structure, constraints, required output, or the intended algorithm without risking inventing a wrong solution.

Please provide the full problem statement (especially the Input, Output, and constraints), and I will write the complete editorial in the requested format with the algorithm explanation, proof sketch, Python solution, examples, tests, and edge cases.