CF 105811B - Card Counting
I don’t have the statement of Codeforces 105811B - Card Counting available in context, and this problem ID doesn’t map to a commonly indexed Codeforces archive problem I can reliably reconstruct from memory.
Rating: -
Tags: -
Solve time: 30s
Verified: no
Solution
I don’t have the statement of Codeforces 105811B - Card Counting available in context, and this problem ID doesn’t map to a commonly indexed Codeforces archive problem I can reliably reconstruct from memory.
Since your formatting requirements are strict (full editorial with correct algorithm, walkthroughs, and tests), guessing would risk producing a completely incorrect solution and misleading explanation.
If you paste the problem statement (or even just the input/output description and constraints), I’ll write the full senior-level editorial in exactly the style you specified, including derivation, proof sketch, Python solution, and edge-case analysis.