Unlocking the Lock: Solving the “Open the Lock” Problem with BFS
Today, we’re diving into a classic interview problem, Open the Lock. This problem requires us to use Breadth-First Search (BFS) to find the shortest path by simulating a lock mechanism with four wheels. Let’s walk through the problem step-by-step, analyze the solution, and cover key details in the code. Problem Overview The problem describes a […]
Implementing a Priority Queue in TypeScript: A Step-by-Step Guide
Priority queues are essential data structures in computer science, especially when dealing with tasks that require ordering based on priority. In this blog post, we’ll explore how to implement a priority queue in TypeScript, which can help solve problems like LeetCode’s 215. Kth Largest Element in an Array. Introduction A priority queue is a special […]
使用TypeScript实现优先队列 (Priority Queue)
前言 大家好!今天我想和大家分享如何使用TypeScript实现一个优先队列(Priority Queue),并利用它来解决LeetCode第215题——数组中的第K个最大元素。在算法面试中,优先队列是一个非常常用的数据结构,理解并能熟练实现它对我们解决一系列问题都有帮助。 问题描述 LeetCode第215题:数组中的第K个最大元素 给定一个未排序的整数数组 nums,找到其中第 k 个最大的元素。 示例: 提示: 解题思路 要找到第 k 个最大的元素,我们可以采用多种方法: 在这篇文章中,我们重点介绍使用最小堆实现的优先队列,因为它在实际应用中非常高效,且实现相对简单。 什么是优先队列? 优先队列是一种特殊的队列,元素按照优先级进行出入队操作。常用的实现方式是堆,根据堆的性质,可以快速地获取当前的最值(最大值或最小值)。 在我们的问题中,我们需要维护一个大小为 k 的最小堆,堆顶元素就是当前第 k 个最大的元素。 TypeScript中实现最小堆 堆的基本操作 实现代码 代码解释 利用最小堆解决第K个最大元素问题 实现思路 实现代码 代码解释 测试代码 时间复杂度分析 空间复杂度分析 总结 通过使用最小堆实现的优先队列,我们可以高效地找到数组中的第 k 个最大元素。这种方法在处理大规模数据时非常实用,因为我们不需要对整个数组进行排序,只需维护一个大小为 k 的堆即可。 优点 缺点 后记 希望这篇文章能帮助大家理解如何在TypeScript中实现优先队列,并应用于实际问题。如果有任何疑问或改进建议,欢迎在评论区与我交流! 参考资料 感谢阅读!如果觉得有帮助,请点赞支持。
430. Flatten a Multilevel Doubly Linked List
You are given a doubly linked list, which contains nodes that have a next pointer, a previous pointer, and an additional child pointer. This child pointer may or may not point to a separate doubly linked list, also containing these special nodes. These child lists may have one or more children of their own, and […]
TypeScript Data Structure: Implementing a Doubly Linked List
用Typescript实现一个双向链表 Design your implementation of the linked list. You can choose to use a singly or doubly linked list. A node in a singly linked list should have two attributes: val and next. val is the value of the current node, and next is a pointer/reference to the next node. If you want to use […]
Typescript Data Structures: Linked List
In the vast expanse of data structures available to developers, the LinkedList holds a unique place. Known for its efficiency in insertion and deletion operations, it’s a staple in algorithm design and application development. This post explores how to implement a LinkedList in TypeScript, bringing together the efficiency of this data structure with the strong […]
448. Find All Numbers Disappeared in an Array
Given an array nums of n integers where nums[i] is in the range [1, n], return an array of all the integers in the range [1, n] that do not appear in nums. Example 1: Input: nums = [4,3,2,7,8,2,3,1] Output: [5,6] Example 2: Input: nums = [1,1] Output: [2] Constraints: n == nums.length 1 <= […]
414. Third Maximum Number
Given an integer array nums, return the third distinct maximum number in this array. If the third maximum does not exist, return the maximum number. Example 1: Input: nums = [3,2,1] Output: 1 Explanation: The first distinct maximum is 3. The second distinct maximum is 2. The third distinct maximum is 1. Example 2: Input: […]