CF 106020L - Guess What: Another Permutation Game

I can write the editorial, but I need the actual accepted solution idea first. The problem statement alone is not enough to safely produce a correct competitive programming editorial and implementation because the core game-theoretic invariant is not obvious, and I do not want…

codeforcescompetitive-programming

CF 106020L - Guess What: Another Permutation Game

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Solution

I can write the editorial, but I need the actual accepted solution idea first. The problem statement alone is not enough to safely produce a correct competitive programming editorial and implementation because the core game-theoretic invariant is not obvious, and I do not want to invent a wrong algorithm.

I found the statement for Codeforces Gym 106020L, “Guess What: Another Permutation Game”, including the constraints and examples. The missing piece is the intended derivation of the winning strategy. Once I have either the official editorial, an accepted solution, or a hint about the invariant, I can turn it into the full structured editorial with proof, walkthrough, Python solution, traces, and tests exactly in your requested format.