1. 题目 Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its…

1、题目描述 Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: …

描述 An array is monotonic if it is either monotone increasing or monotone decreasing. An array A is monotone in…

Medium Given a (singly) linked list with head node root, write a function to split the linked list into k cons…

class Solution(object): def searchMatrix(self, matrix, target): """ :type matrix: List[List[int]] :type target…

  Given a sorted array and a target value, return the index if the target is found. If not, return the in…

  Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = R…

You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest ver…

题目： 给定一个整数数组，判断是否存在重复元素。 如果任何值在数组中出现至少两次，函数返回 true。如果数组中每个元素都不相同，则返回 false。 示例 1: 输入: [1,2,3,1] 输出: true 示例 2:…

这是悦乐书的第207次更新，第219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75题（顺位题号是349）。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…

There are a total of n courses you have to take, labeled from 0 to n – 1. Some courses may have prerequi…

题目 You need to construct a string consists of parenthesis and integers from a binary tree with the preorder tr…