The interviewer didn’t warm up much. He dropped the first

Problem 1 — grouping sums Given a string s made

这道题来自 Salesforce 的真实面试，表面看是简单的数学操作，现场却很容易被带偏，尤其是在“最少操作次数”这个点上，很多候选人会一上来就写 BFS，时间直接炸掉。 题目原文如下： Two Operations Two integer operations

这道题是典型高频题，DoorDash 面试里经常用来观察候选人对数据结构的掌控，以及在有限时间内如何快速收敛到最优解。 英文原题 Top K Frequent Elements Given an integer

这3场面试节奏很快，题目本身不复杂，核心在于定义是否清楚、抽象是否到位，以及被打断时还能继续推进。 Problem 1 — Repeat Customers Original Problem Given an

📝 Problem Description (Original) The manager of the Amazon warehouse

Track Customer Visits and First-Time Visitors Millions of customers visit

Legiana, a Lyft user, is reviewing his rides from a

You are given a one-dimensional stretch of pavement represented by