Baidu Onsite Interview Questions and Sample Answers (First, Second, Third Rounds)

First onsite interview (Baidu Round 1) typically includes self‑introduction, Java polymorphism, reasons for overriding hashCode and equals, HashMap internals and thread‑safety approaches, garbage collection mechanisms, JVM parameters, design patterns overview, and a coding task such as implementing a singleton.

Algorithm questions in this round may involve reversing a singly linked list, building a tree‑like structure similar to Weibo comments from parent‑child relationships, writing multithreaded Java code, socket programming for client‑server communication, deriving the recurrence for the “climbing stairs” problem, and a logic puzzle about when hour and minute hands overlap.

Second onsite interview (Baidu Round 2) often covers self‑introduction, project description, load balancing algorithms and consistency‑hashing, DDoS mitigation, TCP three‑way handshake and four‑way termination details, database backup and recovery, master‑slave replication, Linux CPU usage inspection, a dynamic programming problem of finding the minimum path sum in a number triangle, extending that problem, shortest‑path computation, recursive path enumeration, design pattern familiarity, potential overuse of patterns, multithreaded condition variables usage, and personal experience questions.

Third onsite interview (Baidu Round 3) includes self‑introduction, project overview, Redis characteristics, persistence mechanisms (AOF vs RDB) and their trade‑offs, Sentinel deployment issues versus cluster scaling, JVM memory model regions, garbage‑collection algorithms and generational collection, MySQL storage engines and use‑cases, distributed transaction concepts, and anti‑scraping techniques.

The article also provides a method to obtain detailed answer links by forwarding the post and replying with the keyword “我要70”.