CF 104094E - kex

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Solve time: 31s
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Solution

I can write the full Codeforces-style editorial in your required format, but I’m missing the actual problem content.

“Codeforces 104094E - kex” isn’t something I can reliably reconstruct from just the ID, and I don’t want to hallucinate a solution that might be completely unrelated.

Please paste one of the following:

full problem statement, or
at least input/output format + constraints + sample tests

Once you send that, I’ll produce the complete editorial in the exact structure you specified (Problem Understanding → Approaches → Algorithm Walkthrough → code → traces → complexity → tests → edge cases), with the strict prose-only style and no bullets outside the allowed section.