力扣-429题 N叉树的层序遍历（C++）- N叉树

淡淡的烟草味﹌ 2022-09-02 03:59 169阅读 0赞

题目链接：[https://leetcode-cn.com/problems/n-ary-tree-level-order-traversal/][https_leetcode-cn.com_problems_n-ary-tree-level-order-traversal]  
题目如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNDY3Njcw_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNDY3Njcw_size_16_color_FFFFFF_t_70 1]

/*
    // 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:
        vector<vector<int>> levelOrder(Node* root) {
        
            vector<vector<int>> result;
            if(root==NULL) return result;
    
            queue<Node*> que;
            que.push(root);
    
            while(!que.empty()){
        
                int size=que.size();
                vector<int> temp;
    
                while(size--){
        
                    Node* node=que.front();
                    que.pop();
    
                    temp.push_back(node->val);
    
                    for(int i=0;i<node->children.size();i++){
        
                        Node* tmp=node->children[i];
                        if(tmp) que.push(tmp);
                    }
                }
                result.push_back(temp);
            }
    
            return result;
        }
    };

[https_leetcode-cn.com_problems_n-ary-tree-level-order-traversal]: https://leetcode-cn.com/problems/n-ary-tree-level-order-traversal/
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNDY3Njcw_size_16_color_FFFFFF_t_70 1]: /images/20220829/ea5159e1d0ed462ab1bdff4f23f5f54c.png