![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/133_clone_graph_question.png\")
Given a reference of a node in a connected undirected graph.
\n\nReturn a deep copy (clone) of the graph.
\n\nEach node in the graph contains a value (int) and a list (List[Node]) of its neighbors.
\nclass Node {\n public int val;\n public List<Node> neighbors;\n}\n\n\n\n\n
Test case format:
\n\nFor simplicity, each node's value is the same as the node's index (1-indexed). For example, the first node with val == 1, the second node with val == 2, and so on. The graph is represented in the test case using an adjacency list.
An adjacency list is a collection of unordered lists used to represent a finite graph. Each list describes the set of neighbors of a node in the graph.
\n\nThe given node will always be the first node with val = 1. You must return the copy of the given node as a reference to the cloned graph.
\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/11/04/133_clone_graph_question.png\")
\n\nInput: adjList = [[2,4],[1,3],[2,4],[1,3]]\nOutput: [[2,4],[1,3],[2,4],[1,3]]\nExplanation: There are 4 nodes in the graph.\n1st node (val = 1)'s neighbors are 2nd node (val = 2) and 4th node (val = 4).\n2nd node (val = 2)'s neighbors are 1st node (val = 1) and 3rd node (val = 3).\n3rd node (val = 3)'s neighbors are 2nd node (val = 2) and 4th node (val = 4).\n4th node (val = 4)'s neighbors are 1st node (val = 1) and 3rd node (val = 3).\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/01/07/graph.png\")
\n\nInput: adjList = [[]]\nOutput: [[]]\nExplanation: Note that the input contains one empty list. The graph consists of only one node with val = 1 and it does not have any neighbors.\n\n\n
Example 3:
\n\n\nInput: adjList = []\nOutput: []\nExplanation: This an empty graph, it does not have any nodes.\n\n\n
\n
Constraints:
\n\n[0, 100].1 <= Node.val <= 100Node.val is unique for each node.给你无向 连通 图中一个节点的引用，请你返回该图的 深拷贝（克隆）。
\n\n图中的每个节点都包含它的值 val（int） 和其邻居的列表（list[Node]）。
class Node {\n public int val;\n public List<Node> neighbors;\n}\n\n\n\n
测试用例格式：
\n\n简单起见，每个节点的值都和它的索引相同。例如，第一个节点值为 1（val = 1），第二个节点值为 2（val = 2），以此类推。该图在测试用例中使用邻接列表表示。
邻接列表 是用于表示有限图的无序列表的集合。每个列表都描述了图中节点的邻居集。
\n\n给定节点将始终是图中的第一个节点（值为 1）。你必须将 给定节点的拷贝 作为对克隆图的引用返回。
\n\n\n\n
示例 1：
\n\n
输入：adjList = [[2,4],[1,3],[2,4],[1,3]]\n输出：[[2,4],[1,3],[2,4],[1,3]]\n解释：\n图中有 4 个节点。\n节点 1 的值是 1，它有两个邻居：节点 2 和 4 。\n节点 2 的值是 2，它有两个邻居：节点 1 和 3 。\n节点 3 的值是 3，它有两个邻居：节点 2 和 4 。\n节点 4 的值是 4，它有两个邻居：节点 1 和 3 。\n\n\n
示例 2：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/graph.png\")
输入：adjList = [[]]\n输出：[[]]\n解释：输入包含一个空列表。该图仅仅只有一个值为 1 的节点，它没有任何邻居。\n\n\n
示例 3：
\n\n输入：adjList = []\n输出：[]\n解释：这个图是空的，它不含任何节点。\n\n\n
示例 4：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/graph-1.png\")
输入：adjList = [[2],[1]]\n输出：[[2],[1]]\n\n
\n\n
提示：
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"exampleTestcases": "[[2,4],[1,3],[2,4],[1,3]]\n[[]]\n[]",
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