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Google

Challenges: 21Easy: 5Medium: 10Hard: 6

This Google coding interview set pulls together 21 challenges, with a mix of 5 easy, 10 medium, 6 hard. The problems lean on dynamic-programming, graphs, topological-sort, arrays, two-pointers, so you can drill the patterns that come up most and walk into the interview ready.

Topics this company tests

Google coding challenges

  • Cache Invalidation Planner

    Difficulty: HardTopics: dynamic-programming, graphs, topological-sort

  • Container With Most Water

    Difficulty: MediumTopics: arrays, two-pointers

  • Distributed Lock Expiry Audit

    Difficulty: HardTopics: simulation, state-machine

  • Invert Binary Tree

    Difficulty: MediumTopics: recursion, trees

  • Longest Increasing Subsequence

    Difficulty: HardTopics: arrays, binary-search, dynamic-programming

  • Maximum Subarray

    Difficulty: MediumTopics: arrays, dynamic-programming

  • Meeting Room Scheduler

    Difficulty: MediumTopics: heaps, intervals, sorting

  • Merge K Sorted Lists

    Difficulty: HardTopics: divide-and-conquer, heap, linked-lists

  • Multi Tenant Quota Enforcer

    Difficulty: MediumTopics: hash-map, simulation

  • Plus One

    Difficulty: EasyTopics: arrays

  • Reverse Linked List

    Difficulty: EasyTopics: linked-lists

  • Search in Rotated Sorted Array

    Difficulty: MediumTopics: arrays, binary-search

  • Serialize and Deserialize Binary Tree

    Difficulty: HardTopics: bfs, design, trees

  • Sliding Log Rate Limiter

    Difficulty: MediumTopics: arrays, simulation, sliding-window

  • Three Sum

    Difficulty: MediumTopics: arrays, sorting, two-pointers

  • Token Bucket Refill

    Difficulty: MediumTopics: greedy, queues, simulation

  • Trapping Rain Water

    Difficulty: HardTopics: arrays, stacks, two-pointers

  • Two Sum

    Difficulty: EasyTopics: arrays, hashing

  • Valid Anagram

    Difficulty: EasyTopics: hashing, strings

  • Valid Parentheses

    Difficulty: EasyTopics: stacks, strings

  • Validate Binary Search Tree

    Difficulty: MediumTopics: binary-search, recursion, trees

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