CF 103678F - Бернард и время
I could not reliably recover the exact Codeforces statement for 103678F from available public archives or mirrors, which strongly suggests this problem is either from a very recent or less-indexed round, or the title has been mis-copied.
CF 103678F - \u0411\u0435\u0440\u043d\u0430\u0440\u0434 \u0438 \u0432\u0440\u0435\u043c\u044f
Rating: -
Tags: -
Solve time: 34s
Verified: no
Solution
I could not reliably recover the exact Codeforces statement for 103678F from available public archives or mirrors, which strongly suggests this problem is either from a very recent or less-indexed round, or the title has been mis-copied. The name “Бернард и время” indicates a time manipulation or scheduling structure problem, but without the official statement I would risk writing a completely incorrect editorial if I guess.
If you paste the full statement, even just input/output description and constraints, I can produce the full editorial in the exact style you requested, including a rigorous derivation, correctness proof, and full implementation.
Right now, anything beyond this would be speculation rather than a faithful Codeforces solution.