核心思想是:序列化树 序列化后,用String可以唯一的代表一棵树,其实就是前序遍历改造一下(空节点用符号表示): 一边序列化,一边用哈希表记录有没有重复的,如果有就添加,注意不能重复添加. 重点就是序列化树,序列化得到的String可以唯一的代表一棵树,这个思想很多题都用到了 并不是只是前序遍历就能唯一表示一棵树,加上结构信息就可以了. Map<String,TreeNode> map = new HashMap<>(); List<TreeNode> res = n…

[LeetCode]652. Find Duplicate Subtrees 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/find-duplicate-subtrees/description/ 题目描述: Given a binary tree, return all duplicate sub…

［抄题］: 就是出现了多次的子树,可以只包括一个点. Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node value…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

/** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: unordered_map<string, vector<TreeNode*>> s; ve…

LeetCode 652: 寻找重复的子树 Find Duplicate Subtrees 题目: 给定一棵二叉树,返回所有重复的子树.对于同一类的重复子树,你只需要返回其中任意一棵的根结点即可. 两棵树重复是指它们具有相同的结构以及相同的结点值. Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root nod…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any oneof them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…

Question Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 /…

Given a binary tree, return all duplicate subtrees. For each kind of duplicate subtrees, you only need to return the root node of any one of them. Two trees are duplicate if they have the same structure with same node values. Example 1: 1 / \ 2 3 / /…