所以当numbers[first] + numbers[last] 的和小于target,first+1取下一位更大的数与numbers相加;当numbers[first] + numbers[last] 的和大于target,将last-1取前一位更小的数与numbers[first]相加 653. Two Sum IV - Input is a BST Given a Binary Search Tree and a target number, return true if th...
leetcode 653 Two Sum IV - Input is a BST 详细解答 解法1 因为这个是二叉搜索树,可以想到先将二叉树进行中序遍历得到一个有序数组,然后然后双指针 (leetcode 167)来求解。 代码如下: 时间复杂度:O(N),空间复杂度:O(N) 解法2 这里借用set进行查询。用层序遍历依次查询。 时间复杂度:O(N), 空间复杂度...
Can you solve this real interview question? Two Sum IV - Input is a BST - Given the root of a binary search tree and an integer k, return true if there exist two elements in the BST such that their sum is equal to k, or false otherwise. Example 1: [
leetcode 1.Two Sum 、167. Two Sum II - Input array is sorted 、15. 3Sum 、16. 3Sum Closest 、 18. 4Sum 、653. Two Sum IV - Input is a BST 、454. 4Sum II 1.two sum 用hash来存储数值和对应的位置索引,通过target-当前值来获得需要的值,然后再hash中寻找 错误代码1: Input: [3,2,4...
24)Insert into a Binary Search Tree You are given the root node of a binary search tree (BST) and a value to insert into the tree. Return the root node of the BST after the insertion. It is guaranteed that the new value does not exist in the original BST. Notice that there may ex...
A binary search tree, sometimes called BST, is a type of binary tree which maintains the property that the value in each node must be greater than or equal to any value stored in the left sub-tree, and less than or equal to any value stored in the right sub-tree ...
今天介绍的是LeetCode算法题中Easy级别的第148题(顺位题号是653)。给定二进制搜索树和目标数,如果BST中存在两个元素,使得它们的总和等于给定目标,则返回true。例如: 5 / \ 3 6 / \ \ 2 4 7 目标值:9 输出:true 5 / \ 3 6 / \ \ 2 4 7 ...
题目要求 Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. 题目分析及思路 给定一个二叉搜索树和一个目标值,若该树中存在两个元素的和等于目标值则返回true。可以先获得树中所有结点的值列表,然后...
leetcode 653. Two Sum IV - Input is a BST Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input:5 / \ 3 6 / \ \...
1666.Change-the-Root-of-a-Binary-Tree (H-) 1932.Merge-BSTs-to-Create-Single-BST (H) 2003.Smallest-Missing-Genetic-Value-in-Each-Subtree (H) 2277.Closest-Node-to-Path-in-Tree (H-) 2313.Minimum-Flips-in-Binary-Tree-to-Get-Result (H) 2322.Minimum-Score-After-Removals-on-a-Tree (H...