![\"\"](\"https://assets.leetcode.com/uploads/2021/05/12/shortest2-graph.jpg\")
You have an undirected, connected graph of n nodes labeled from 0 to n - 1. You are given an array graph where graph[i] is a list of all the nodes connected with node i by an edge.
Return the length of the shortest path that visits every node. You may start and stop at any node, you may revisit nodes multiple times, and you may reuse edges.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/05/12/shortest1-graph.jpg\")
\n\nInput: graph = [[1,2,3],[0],[0],[0]]\nOutput: 4\nExplanation: One possible path is [1,0,2,0,3]\n\n\n
Example 2:
\n\n\nInput: graph = [[1],[0,2,4],[1,3,4],[2],[1,2]]\nOutput: 4\nExplanation: One possible path is [0,1,4,2,3]\n\n\n
\n
Constraints:
\n\nn == graph.length1 <= n <= 120 <= graph[i].length < ngraph[i] does not contain i.graph[a] contains b, then graph[b] contains a.存在一个由 n 个节点组成的无向连通图，图中的节点按从 0 到 n - 1 编号。
给你一个数组 graph 表示这个图。其中，graph[i] 是一个列表，由所有与节点 i 直接相连的节点组成。
返回能够访问所有节点的最短路径的长度。你可以在任一节点开始和停止，也可以多次重访节点，并且可以重用边。
\n\n\n\n
示例 1：
\n\n\n输入：graph = [[1,2,3],[0],[0],[0]]\n输出：4\n解释：一种可能的路径为 [1,0,2,0,3]\n\n
示例 2：
\n\n
\n输入：graph = [[1],[0,2,4],[1,3,4],[2],[1,2]]\n输出：4\n解释：一种可能的路径为 [0,1,4,2,3]\n\n\n
\n\n
提示：
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