We define a harmonious array is an array where the difference between its maximum value and its minimum…

  If the depth of a tree is smaller than 5, then this tree can be represented by a list of three-dig…

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessa…

题目描述 给定一个数组和滑动窗口的大小，找出所有滑动窗口里数值的最大值。例如，如果输入数组{2,3,4,2,6,2,5,1}及滑动窗口的大小3，那么一共存在6个滑动窗口，他们的最大值分别为{4,4,6,6,6,5}； 针…

这是悦乐书的第193次更新，第197篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第53题（顺位题号是219）。给定整数数组和整数k，找出数组中是否存在两个不同的索引i和j，使得nums […

这是悦乐书的第208次更新，第220篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第76题（顺位题号是350）。给定两个数组，编写一个函数来计算它们的交集。例如： 输入：nums1 = [1…

title: binary-tree-postorder-traversal 描述 Given a binary tree, return the postorder traversal of its nodesR…

Hard 这道题给的例子我一眼看去觉得是Level Order在做遍历，所以索性就用层级遍历做吧。在deserialize那块index的问题上纠结了很长时间,仍然不是很确定 /** * Definition for a…

Given a sorted integer array without duplicates, return the summary of its ranges. Example 1: Input: [0,1,2,4,…

/* * 298. Binary Tree Longest Consecutive Sequence My Submissions QuestionEditorial Solution Total Accepted: 9…

  Given an array S of n integers, find three integers in S such that the su…

  There are N students in a class. Some of them are friends, while some are not. Their friendsh…