Raab Game I
Two players each play cards `1..n` in some order; the higher card scores a point per round. Given `(n, a, b)`, exhibit orders producing scores `a` and `b`, or report that none exist.
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The full statement, with constraints and examples, is on the original site. The specification is at TalosEval/Problems/CSES/RaabGameI/Spec.lean.
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