Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. Example : Input: root = [5,1,5,5,5,null,5] 5 / \ 1 5 / \ \ 5 5 5 Output: 4 /** * Definition for a binary tree node. *…

题目: Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. 链接: http://leetcode.com/problems/count-univalue-su…

Problem: Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. Analysis: This problem is super simple. But,…

Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. Example : Input: root = [5,1,5,5,5,null,5] 5 / \ 1 5 / \ \ 5 5 5 Output: 4 题意: 给定一棵二叉树,求所有节点都同值的二叉树. 思路: dfs 代码: clas…

Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. 给一个二叉树,求唯一值子树的个数.唯一值子树的所有节点具有相同值. 解法:递归 Java: /** * De…

Count Univalue Subtrees Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. 分析: 有点像自低向上的动态规划,既然是自底向上,看来用递归…

Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. 这道题让我们求相同值子树的个数,就是所有节点值都相同的子树的个数,之前有道求最大BST子树的题Largest…

Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example:Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. 给定一个二叉树,计算单值子树的数目. 单值子树意味着子树的所有节点都具有相同的值. 例如: 给定二叉树, 5…

Given a binary tree, count the number of uni-value subtrees. A Uni-value subtree means all nodes of the subtree have the same value. For example: Given binary tree, 5 / \ 1 5 / \ \ 5 5 5 return 4. Solution: /** * Definition for a binary tree node. *…

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 / /…