How to Solve Clone Graph Problem
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Clone Graph
Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph. Each node in the graph contains a value (int) and a list (List[Node]) of its neighbors. class Node...
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Understanding the Clone Graph Problem
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Problem Statement
Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph. Each node in the graph contains a value (int) and a list (List[Node]) of its neighbors. class Node { public int val; public List<Node> neighbors; } Test case format: For 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. The 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.
Clone Graph
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Examples
adjList = [[2,4],[1,3],[2,4],[1,3]][[2,4],[1,3],[2,4],[1,3]]There are 4 nodes in the graph. 1st node (val = 1)'s neighbors are 2nd node (val = 2) and 4th node (val = 4). 2nd node (val = 2)'s neighbors are 1st node (val = 1) and 3rd node (val = 3). 3rd node (val = 3)'s neighbors are 2nd node (val = 2) and 4th node (val = 4). 4th node (val = 4)'s neighbors are 1st node (val = 1) and 3rd node (val = 3).
adjList = [[]][[]]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.
adjList = [][]This an empty graph, it does not have any nodes.
Constraints
The number of nodes in the graph is in the range [0, 100].1 <= Node.val <= 100Node.val is unique for each node.There are no repeated edges and no self-loops in the graph.The Graph is connected and all nodes can be visited starting from the given node.How Interview Coder Helps with Leetcode Problems
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