Given a string containing only digits, restore it by returning all possible valid IP address combinations. For…

961. N-Repeated Element in Size 2N Array 题目链接 961. N-Repeated Element in Size 2N Array 题目分析 在长度为2N的数组A中，有N+1个元…

这是悦乐书的第274次更新，第290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142题（顺位题号是617）。提供两个二叉树，将其合并为新的二叉树，也可以在其中一个二叉树上进行覆盖。合并…

题意：在一堆点中找符合条件的点的总组数：每组点共有三个，且第一个点到第二个点和到第三个点的距离相同。点的顺序不同表示不同的组数。 解题：用一个map记录遍历的该点point1的信息，key表示该点到另外点point2的距…

题目 Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple …

题目 In a given integer array nums, there is always exactly one largest element. Find whether the largest elemen…

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

题目： Given a string containing just the characters '(' and ')', find the length of the longest v…

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it.Note: You may …

Given an array of non-negative integers, you are initially positioned at the first index of the array. Each el…

描述： Given a binary tree, return the zigzag level order traversal of its nodes’ values. (ie, from left to…

问题描述 Given an array and a value, remove all instances of that value in-place and return the new length.Do not …