\(\def \set #1#2{\{ #1 \ \vert \ #2 \}}\) ABC314F 問題概要 有向 tree \(T\) を構成する. \(N := \{0, 1, \cdots, N-1\}\) \(|V(T)| = 2N-1\) The set \(L := \set{\{i\}}{ i \in N}\) is the set of leafs of T. For any vertex \(x\) of \(V\) is a subset of \(L\). There is a unique \(r \in V(T)\) such that \(r = N\). We d…