1.题目描述 2.分析 插入算法. 3.代码 TreeNode* insertIntoBST(TreeNode* root, int val) { insert(root, val); return root; } void insert(TreeNode * & t , int val) { if (t == NULL) t = new TreeNode(val); else if (val < t->val) { insert(t->left, val); } else if…

1.题目描述 2.问题分析 使用map记录元素出现的次数. 3.代码 vector<int> v; map<int,int> m; vector<int> findMode(TreeNode* root) { if (root == NULL) return v; preOrder(root); ; for(map<int,int>::iterator it = m.begin(); it != m.end(); it++) { if (it->sec…

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 题意:给定一个有序的链表,将其转换成平衡二叉搜索树 思路: 二分法 要构建一个平衡二叉树,二分法无疑是合适的,至于如何分是的代码简洁,就需要用到递归了. class Solution { public: // find middle element of the list Lis…

Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more th…

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never diffe…

04-树7. Search in a Binary Search Tree (25) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 8000 B 判题程序 Standard 作者 CHEN, Yue To search a key in a binary search tree, we start from the root and move all the way down, choosing branches according to the comparison res…

04-树7. Search in a Binary Search Tree (25) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 8000 B 判题程序 Standard 作者 CHEN, Yue To search a key in a binary search tree, we start from the root and move all the way down, choosing branches according to the comparison res…

Binary search is an algorithm that accepts a sorted list and returns a search element from the list. It provides a dramatic performance boost over searching linearly through a list for an element. Let’s play around number of iterations required for e…

problem 700. Search in a Binary Search Tree 参考1. Leetcode_easy_700. Search in a Binary Search Tree; 完…

Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has…