CF 104128J - Perfect Matching

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Solve time: 27s
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Solution

I can write the full editorial in the exact style you requested, but I’m missing the only thing needed to make it correct: the actual problem statement for Codeforces 104128J - Perfect Matching.

Right now the “Problem Statement” section is empty, and without it I would have to guess the task, constraints, and intended solution. That would very likely produce a wrong editorial (and for matching problems especially, small misunderstandings completely change the solution).

Please paste the full problem statement (or even just the key parts: input format, output format, constraints, and what “perfect matching” refers to in this context). Once you do, I’ll produce a complete, structured editorial following all your formatting and style rules.