List of common Google interview questions

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 Here's a list of common Google interview questions, categorized by type:

Coding/Algorithm Questions:

  1. Reverse a Linked List - Given a linked list, reverse it.
  2. Find the Longest Substring Without Repeating Characters - In a string, find the longest substring that does not repeat any characters.
  3. Merge Intervals - Given a collection of intervals, merge overlapping intervals.
  4. Implement a Trie (Prefix Tree) - Build a Trie data structure from scratch.
  5. Kth Largest Element in an Array - Find the Kth largest element in an unsorted array.
  6. Detect a Cycle in a Linked List - Given a linked list, determine if it has a cycle.
  7. Find All Anagrams in a String - Given a string and a non-empty pattern, find all substrings in the string that are anagrams of the pattern.
  8. Binary Tree Maximum Path Sum - Given a binary tree, find the maximum path sum.
  9. Rotting Oranges - Given a grid of oranges, determine how many minutes it takes for all oranges to rot, or return -1 if it is impossible.
  10. Word Ladder - Given two words (beginWord and endWord), and a dictionary's word list, find the length of the shortest transformation sequence from beginWord to endWord.

System Design Questions:

  1. Design a URL Shortener - How would you design a system like bit.ly?
  2. Design a Search Engine - How would you build a large-scale search engine like Google Search?
  3. Design Google Drive - How would you design a system for storing, sharing, and editing files online?
  4. Design a Distributed Caching System - How would you design a distributed cache like Memcached or Redis?
  5. Design a Chat Application - How would you design a real-time messaging system like WhatsApp?
  6. Design a Recommendation System - How would you design a recommendation engine for a platform like YouTube or Netflix?
  7. Design a Scalable Web Crawler - How would you design a web crawler to efficiently index the internet?
  8. Design a Social Media Platform - How would you design a system for users to post, follow, and interact with content (like Twitter)?
  9. Design a Load Balancer - How would you design a load balancer to distribute traffic across multiple servers?
  10. Design an API Rate Limiter - How would you design a system that limits the rate of API requests?

Behavioral Questions:

  1. Tell me about a time you failed.
  2. Describe a challenging project you worked on.
  3. How do you handle tight deadlines?
  4. Tell me about a time you had to resolve a conflict within your team.
  5. How do you prioritize tasks?
  6. Describe a time when you had to learn something new quickly.
  7. Tell me about a time you had to deal with ambiguity in a project.
  8. How do you approach problem-solving?
  9. Describe a time when you took initiative in a project.
  10. Tell me about a time when you had to influence others to achieve a goal.

Problem-Solving Questions:

  1. Estimate the number of tennis balls that can fit in a Boeing 747.
  2. How would you design a simple calculator?
  3. How many ways can you split a string of length N into K substrings?
  4. Explain the process of garbage collection in Java.
  5. What happens when you type a URL into a browser and press enter?
  6. Design an algorithm to find the median of a large data stream.
  7. Explain the concept of database normalization.
  8. How would you optimize the performance of a slow SQL query?
  9. Describe how you would solve the "Two Sum" problem.
  10. How would you handle a situation where a system you designed is failing intermittently?

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