A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord -> s1 -> s2 -> … -…

Design a system that allows multiple users to collaborate on a document. Description For MVP, focus on: Defining back-end APIs for interaction between c…

Return the average of the values in a given range in a binary search tree. Example: [4,11] => avg(6,10,4,9) => return 7.xx 这道题要求在二叉搜索树中统计某个数值区间内所有节点的平均值…

Can we assume the input is sorted or not? You can sort by the start time of each interval. Merge the overlapping meetings with a loop over the meetings….

Description: Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand, for example, [0,1,2,4,5,6,7] might become [4…

For each category, find the top 3 users with the highest total purchase amount. Input format: user_id, category_id, date, amount u1, retail, 20210101, 1…

Design a backend system for an e-commerce website that shows a list of merchandise. The system should focus on the browsing aspect, not on how to make p…

Find the distance between two nodes in a binary tree. The distance between two nodes is defined as the minimum number of edges to be traversed to reach…

Build a system that calculates the price of a customer’s order in a furniture store. Pricing rules are as follows: Used items get a 20% discount off the…

System Design Question: Bank Transaction Analysis System Problem Statement You are designing a system that pulls user bank transactions from external fi…

Decode String Given an encoded string, return its decoded string. The encoding rule is: k[encoded_string] , where the encoded_string inside the square b…

Given an array of non-negative integers representing the elevations from the vertical cross section of a range of hills, determine how many units of sno…

Question Prompt Design the technical architecture of a log management system for a microservices-based application, defining the components of the syste…

Design a system which allows users to upload media and share with the world or with specific people. 这道题考察的是一个典型的系统设计题：如何支持用户上传媒体文件，并将内容设置为公开可见或仅对指定用户可见…

Two Dimensional Linked Lists You work for a package delivery company, and they need you to write code that flattens and sorts connected lists of package…

Fetch and Render Questions Question description There is an API that can return question data: https://664353ed6c6a6565870698da.mockapi.io/api/test/ques…

Find the Special Interest in Each Board You are scrolling through Pinterest and stumble upon a collection of boards. Each board is organized such that i…

Instagram College Students Visiting Search on the Day of Registration, by Country Table: ig_users This table has one row for every Instagram user. Colum…

[SQL] What are the top 10 Pop songs based on the engagement rate? Tables: song_df , fact_df Use the tables to find the 10 Pop songs with the highest eng…

Find the unique element in an array where all other elements appear twice except one. Examples: [1, 1, 4, 4, 7, 8, 8, 29, 29] -> 7 [1, 2, 2, 3, 3] -&…