Google Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Find Minimum Rooms Needed
You are given a list of meeting intervals, where each interval is represented as [start, end) and start < end. Two meetings conflict if their time ran...
Find Earliest Fully Connected Time
You are given n people labeled 0 to n - 1 and a list of friendship logs. Each log has the form (timestamp, personA, personB, action), where action is ...
Design a restaurant waitlist system
You are implementing the waitlist system for a restaurant. Parties arrive over time, can cancel, and get seated when a table becomes available. Rules ...
Can board states be transformed?
You are given two strings, start and target, of equal length representing a one-dimensional board. Each character is one of: - L: a piece that may mov...
Check if all substrings are anagrams of words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Implement substring search and weighted sampling
Two coding questions were asked in the onsite. 1. Substring search: Given two strings text and pattern, return the starting index of the first occurre...
Check if all substrings are dictionary words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Explain ranking cold-start strategies
You are interviewing for a machine learning engineer role focused on search, recommendations, or ranking. Discuss the following in the context of a la...
Compute winning probability on 1D dice walk
You are on an infinite 1D number line starting at position 0. Repeatedly roll a fair die that returns an integer uniformly at random from 1 to K (incl...
Apply Range Overwrite Queries
You are given an integer array nums of length n and a list of range-assignment queries. Each query is a tuple (left, right, value), where left and rig...
Return dictionary words matching a prefix
You are given a list of strings words (a dictionary) and a string prefix. Return all words in words that start with prefix. Clarifications/constraints...
Determine if a 14-tile hand is winning
You are given an integer array tiles of length 14 representing a Mahjong-like hand. Each integer is a tile value from 1 to 9 (single suit). You may re...
Describe Key Behavioral Examples
Prepare to answer behavioral questions based on past internship or project experience. Common prompts include: 1. Tell me about a time when you disagr...
Find top-k distinct elements
Given an integer array nums and an integer k, return the k largest distinct values from nums. Requirements - Values in the output must be distinct (no...
Solve several coding interview problems
The interview included the following coding problems: 1. Decode ambiguous Morse text: Use the standard Morse mapping for letters A-Z. You are given a ...
Design a pub-sub replay system
Assume you have a distributed publish-subscribe messaging system with topics, publishers that write messages, and subscribers that consume them. Desig...
Compute minimum rooms for time intervals
You are given a list of meeting time intervals, where each interval is represented as [start, end) (start time inclusive, end time exclusive) and star...
Simulate meeting-room bookings and return busiest room
You manage n meeting rooms labeled 0..n-1 and receive a list of meetings. Each meeting is an interval [start, end) with start < end. Process meetings ...
Explain LLM fine-tuning and generative models
Machine Learning fundamentals (LLM / Generative AI track) You are interviewed for an ML role focused on LLMs and generative AI. Part A — LLM fine-tuni...
Compute minimum number of rooms needed
Problem You are given a list of meetings, each with a start time and end time. A single room can host only one meeting at a time. Two meetings overlap...