1490. Clone N-ary Tree

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1490. Clone N-ary Tree

Description

Given a root of an N-ary tree, return a deep copy (clone) of the tree.

Each node in the n-ary tree contains a val (int) and a list (List[Node]) of its children.

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class Node {
    public int val;
    public List<Node> children;
}

Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples).

Example 1:

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Input: root = [1,null,3,2,4,null,5,6]
Output: [1,null,3,2,4,null,5,6]

Example 2:

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Input: root = [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]
Output: [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]

Constraints:

  • The depth of the n-ary tree is less than or equal to 1000.
  • The total number of nodes is between [0, 10^4].

Follow up: Can your solution work for the graph problem?

Hints/Notes

  • N/A

Solution

Language: C++

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/*
// Definition for a Node.
class Node {
public:
    int val;
    vector<Node*> children;

    Node() {}

    Node(int _val) {
        val = _val;
    }

    Node(int _val, vector<Node*> _children) {
        val = _val;
        children = _children;
    }
};
*/

class Solution {
public:
    Node* cloneTree(Node* root) {
        if (!root) {
            return nullptr;
        }
        Node* newRoot = new Node(root->val);
        for (auto child : root->children) {
            newRoot->children.push_back(cloneTree(child));
        }
        return newRoot;
    }
};