You are given an undirected tree with n vertices labeled from $1$ to $n$. A frog starts at vertex $1$, at time $0$, and makes one move per second.

At each step, the frog follows these rules:

1. Move to an unvisited neighbor:
   If the frog has unvisited neighbors, it jumps to one of them, chosen uniformly at random (equal probability for each choice).

2. No revisiting:
   The frog can not jump back to a vertex it has already visited.

3. Stay when stuck:
   The frog will keep jumping at its current vertex if there are no unvisited neighbors.

The tree is represented as an array of edges, where edges[i] = [$a_i$, $b_i$ ...