clone-graph

Clone Graph

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cloneGraph

Given a reference of a node in a <a href="https://en.wikipedia.org/wiki/Connectivity_(graph_theory)#Connected_graph" target="_blank">connected</a> undirected graph.

Return a <a href="https://en.wikipedia.org/wiki/Object_copying#Deep_copy" target="_blank">deep copy</a> (clone) of the graph.

Each node in the graph contains a value (<code>int</code>) and a list (<code>List[Node]</code>) of its neighbors.

<pre>
class Node {
 public int val;
 public List&lt;Node&gt; neighbors;
}
</pre>

&nbsp;

Test case format:

For simplicity, each node&#39;s value is the same as the node&#39;s index (1-indexed). For example, the first node with <code>val == 1</code>, the second node with <code>val == 2</code>, 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.

The given node will always be the first node with <code>val = 1</code>. You must return the copy of the given node as a reference to the cloned graph.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2019/11/04/133_clone_graph_question.png" style="width: 454px; height: 500px;" />
<pre>
Input: adjList = [[2,4],[1,3],[2,4],[1,3]]
Output: [[2,4],[1,3],[2,4],[1,3]]
Explanation: There are 4 nodes in the graph.
1st node (val = 1)&#39;s neighbors are 2nd node (val = 2) and 4th node (val = 4).
2nd node (val = 2)&#39;s neighbors are 1st node (val = 1) and 3rd node (val = 3).
3rd node (val = 3)&#39;s neighbors are 2nd node (val = 2) and 4th node (val = 4).
4th node (val = 4)&#39;s neighbors are 1st node (val = 1) and 3rd node (val = 3).
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2020/01/07/graph.png" style="width: 163px; height: 148px;" />
<pre>
Input: adjList = [[]]
Output: [[]]
Explanation: 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.
</pre>

Example 3:

<pre>
Input: adjList = []
Output: []
Explanation: This an empty graph, it does not have any nodes.
</pre>

&nbsp;
Constraints:

<ul>
	<li>The number of nodes in the graph is in the range <code>[0, 100]</code>.</li>
	<li><code>1 &lt;= Node.val &lt;= 100</code></li>
	<li><code>Node.val</code> is unique for each node.</li>
	<li>There are no repeated edges and no self-loops in the graph.</li>
	<li>The Graph is connected and all nodes can be visited starting from the given node.</li>
</ul>

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