［抄题］: Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly twoor zero sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-no…

problem 671. Second Minimum Node In a Binary Tree 参考 1. Leetcode_easy_671. Second Minimum Node In a Binary Tree; 完…

Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nodes.…

Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nodes.…

题目: Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nod…

题目在这里,要求一个二叉树的倒数第二个小的值.二叉树的特点是父节点的值会小于子节点的值,父节点要么没有子节点,要不左右孩子节点都有. 分析一下,根据定义,跟节点的值肯定是二叉树中最小的值,剩下的只需要找到左右子树中比跟节点大的最小值就可以了.对于这个题目,还是考察的二叉树的搜索,第一印象是BFS.使用一个辅助队列存储遍历过程中的节点,遍历过程中,如果节点的值比结果中第二小的值还大,就不用继续把该节点及其所有的子节点入队了,这样可以节省时间.这里的辅助队列使用的是deque,在两端存取数据的复杂度…

Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has exactly two or zero sub-node. If the node has two sub-nodes, then this node's value is the smaller value among its two sub-nodes.…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 找出所有值再求次小值 遍历时求次小值 日期 题目地址:https://leetcode.com/problems/second-minimum-node-in-a-binary-tree/description/ 题目描述 Given a non-empty special binary tree consisting of nodes with t…

/** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ static int wing=[]() { std::ios::sync_with_stdio(false); cin.tie(NULL); ; }();…

671. 二叉树中第二小的节点 671. Second Minimum Node In a Binary Tree 题目描述 给定一个非空特殊的二叉树,每个节点都是正数,并且每个节点的子节点数量只能为 2 或 0.如果一个节点有两个子节点的话,那么这个节点的值不大于它的子节点的值. 给出这样的一个二叉树,你需要输出所有节点中的第二小的值.如果第二小的值不存在的话,输出 -1. 每日一算法2019/5/12Day 9LeetCode671. Second Minimum Node In a Bin…