题目: Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example:Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ \ 7 2 1 return…
Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL. Initially, al…
1. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example: Given nums = [2…
题目描述 给出一个有序数组,请在数组中找出目标值的起始位置和结束位置 你的算法的时间复杂度应该在O(log n)之内 如果数组中不存在目标,返回[-1, -1]. 例如: 给出的数组是[5, 7, 7, 8, 8, 10],目标值是8, 返回[3, 4]. Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime…
给定一个完美二叉树,其所有叶子节点都在同一层,每个父节点都有两个子节点.二叉树定义如下:struct Node { int val; Node *left; Node *right; Node *next;}填充它的每个 next 指针,让这个指针指向其下一个右侧节点.如果找不到下一个右侧节点,则将 next 指针设置为 NULL.初始状态下,所有 next 指针都被设置为 NULL. 示例:输入:{"$id":"1","left":{&…
