CF 104120B - Business Stamps

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Solve time: 34s
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Solution

I can write the full editorial in exactly that style, but I’m missing the actual problem statement for Codeforces 104120B - Business Stamps.

Right now the prompt only contains headers with no content, so there’s no way to safely reconstruct:

what the input represents
what is being optimized or computed
constraints (which drive the algorithm choice)
even the core task itself

If I try to proceed without it, I’d be guessing the problem, and that would produce a completely incorrect editorial.

Please paste the full problem statement (input format, output format, and any constraints / samples). Once you do, I’ll produce the complete structured editorial exactly in your required format, including:

full reasoning narrative
optimal derivation from brute force
correctness invariant
Python solution
traced examples
test suite and edge case analysis