Given a binary tree, return the inorder traversal of its nodes’ values. Example: Input: [1,null,2,3] 1 \…

1. 题目 Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the f…

题目描述 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest p…

Given a binary tree, flatten it to a linked list in-place. For example, given the following tree: 1 / \ 2 5 / …

  Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 click to sh…

题目： Given a linked list, remove the nth node from the end of list and return its head. For example, …

题目地址：https://leetcode-cn.com/probl…题目描述：给出一个区间的集合，请合并所有重叠的区间。 示例 1: 输入: [[1,3],[2,6],[8,10],[15,18]]输出: …

  A string S of lowercase letters is given. We want to partition this string into as many parts…

题目： Clone an undirected graph. Each node in the graph contains a label and a list of its neighb…

题目描述 Serialization is the process of converting a data structure or object into a sequence of bits so that it …

题目描述 Find the contiguous subarray within an array (containing at least one number) which has the largest sum. …

  Given a rows x cols screen and a sentence represented by a list of words, find how many …