Author: admin

  • Artificial Intelligence 101: AI Hallucination

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    admin

    人工智能幻觉 AI hallucination refers to the phenomenon where an artificial intelligence system, particularly those based on generative models or large language models like GPT, produces outputs that are incorrect, nonsensical, or entirely fabricated, despite appearing coherent and plausible. This can happen when the AI makes up facts, invents details, or…

  • LeetCode: 100 Same Tree

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    admin

    Given the roots of two binary trees p and q, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical, and the nodes have the same value. Example: Input: p = [1,2,3], q = [1,2,3] Output:…

  • Artificial Intelligence 101: Pathfinding

    Artificial Intelligence 101: Pathfinding

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    admin

    路径查找 Pathfinding is the process of determining the best route or path from a starting point to a destination within a given environment. This concept is fundamental in various fields such as navigation systems, robotics, and video games, where it is crucial to find the most efficient or optimal path…

  • LeetCode: 141 Linked List Cycle

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    admin

    Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer. Internally, pos is used to…

  • LeetCode 101: 21 Merge Two Sorted Lists

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    admin

    You are given the heads of two sorted linked lists list1 and list2. Merge the two lists in a one-sorted list. The list should be made by splicing together the nodes of the first two lists. Return the head of the merged linked list. Example: Input: list1 = [1,2,4], list2…

  • Python 101: zip_longest Code Breakdown

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    admin

    Code Breakdown ''.join(a + b for a, b in zip_longest(word1, word2, fillvalue='')) Step 1: Understanding zip_longest English: The zip_longest function is imported from the itertools module. It takes multiple iterables (in this case, word1 and word2) and pairs their elements together. If the iterables are of different lengths, it fills…

  • System Design 101: How Does SSH Work

    System Design 101: How Does SSH Work

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    admin

    SSH 是如何工作的？ Introduction 介绍 SSH (Secure Shell) is a widely used network protocol that provides a secure way to access remote machines over an unsecured network. It offers encryption, secure authentication, and data transfer mechanisms, making it a cornerstone of secure remote communication in many IT environments. SSH（安全外壳）是一种广泛使用的网络协议，它提供了一种通过不安全网络安全访问远程机器的方法。它提供了加密、安全身份验证和数据传输机制，使其成为许多 IT 环境中安全远程通信的基石。…

  • System Design 101: What Happens When You Type a URL in the Address Bar

    System Design 101: What Happens When You Type a URL in the Address Bar

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    admin

    当你在地址栏中输入 URL 时会发生什么？ Introduction 介绍 When you type a URL into the address bar of your browser, a complex series of steps occur behind the scenes to fetch and display the web page. Understanding this process is crucial for web developers and those interested in how the internet works. The…

  • LeetCode: 206 Reverse Linked List

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    admin

    Given the head of a singly linked list, reverse the list, and return the reversed list. Example: Input: head = [1,2,3,4,5] Output: [5,4,3,2,1] Example: Input: head = [1,2] Output: [2,1] Example: Input: head = [] Output: [] 问题 给定一个单链表的头节点，将链表反转，并返回反转后的链表。 解决方案 1 迭代法 Approach 1 / 方法 1 This solution uses…

  • Algorithms 101: PostOrder Traversal

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    admin

    后序遍历 PostOrder traversal is a tree traversal method where the root node is visited after its children. It is one of the depth-first search (DFS) methods used to explore all the nodes in a tree. In PostOrder traversal, the process is to recursively visit the left subtree first, then the…