CF 105500C - How Many Keys?
I don’t have the problem statement for Codeforces 105500C “How Many Keys?” available in your prompt, and I can’t reliably reconstruct it from the title alone without risking inventing details.
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Solve time: 29s
Verified: no
Solution
I don’t have the problem statement for Codeforces 105500C “How Many Keys?” available in your prompt, and I can’t reliably reconstruct it from the title alone without risking inventing details.
To write a correct editorial (especially one with proofs, edge cases, and test traces), I need at least one of the following:
The full problem statement, or
A short description of the task, including input format, output format, and constraints.
Once you paste that, I’ll produce the full structured editorial in the exact format you requested.