ZorixOS
64+ ByteDance questions

ByteDance interview questions and how to prepare

The questions candidates report from ByteDance interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in ByteDance's interview style.

Practice ByteDance questions free All companies

ZorixOS tracks 64 community-reported ByteDance interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 78 original ZorixOS practice questions written in ByteDance's known interview style (not claimed as asked at ByteDance), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to ByteDance.

Updated July 2026

ByteDance interview questions candidates report

Community-reported from real ByteDance interviews (open-source dataset), most-asked first. Showing 60 of 64. Each links to its source.

  1. Longest Increasing Subsequence
    ArrayBinary SearchDynamic Programming
    Medium100% asked
  2. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium100% asked
  3. Delete Node in a BST
    TreeBinary Search TreeBinary Tree
    Medium88% asked
  4. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium88% asked
  5. Single Element in a Sorted Array
    ArrayBinary Search
    Medium88% asked
  6. Remove Duplicate Letters
    StringStackGreedyMonotonic Stack
    Medium87% asked
  7. Smallest Subsequence of Distinct Characters
    StringStackGreedyMonotonic Stack
    Medium87% asked
  8. First Day Where You Have Been in All the Rooms
    ArrayDynamic Programming
    Medium85% asked
  9. Combination Sum
    ArrayBacktracking
    Medium77% asked
  10. Course Schedule
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium77% asked
  11. Basic Calculator II
    MathStringStack
    Medium72% asked
  12. Merge Intervals
    ArraySorting
    Medium72% asked
  13. Shortest Bridge
    ArrayDepth-First SearchBreadth-First SearchMatrix
    Medium72% asked
  14. House Robber
    ArrayDynamic Programming
    Medium69% asked
  15. Maximal Square
    ArrayDynamic ProgrammingMatrix
    Medium69% asked
  16. Design Memory Allocator
    ArrayHash TableDesignSimulation
    Medium67% asked
  17. Regular Expression Matching
    StringDynamic ProgrammingRecursion
    Hard67% asked
  18. Top K Frequent Elements
    ArrayHash TableDivide and ConquerSorting
    Medium67% asked
  19. Two Sum
    ArrayHash Table
    Easy64% asked
  20. Word Ladder
    Hash TableStringBreadth-First Search
    Hard64% asked
  21. Add Two Numbers
    Linked ListMathRecursion
    Medium60% asked
  22. Basic Calculator
    MathStringStackRecursion
    Hard60% asked
  23. Combination Sum II
    ArrayBacktracking
    Medium60% asked
  24. Longest Common Subsequence
    StringDynamic Programming
    Medium60% asked
  25. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium60% asked
  26. Maximum Width of Binary Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Medium60% asked
  27. Multiply Strings
    MathStringSimulation
    Medium60% asked
  28. Rotting Oranges
    ArrayBreadth-First SearchMatrix
    Medium60% asked
  29. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium60% asked
  30. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard60% asked
  31. Accounts Merge
    ArrayHash TableStringDepth-First Search
    Medium57% asked
  32. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy57% asked
  33. Decode String
    StringStackRecursion
    Medium57% asked
  34. Restore IP Addresses
    StringBacktracking
    Medium57% asked
  35. 3Sum Closest
    ArrayTwo PointersSorting
    Medium51% asked
  36. Binary Tree Zigzag Level Order Traversal
    TreeBreadth-First SearchBinary Tree
    Medium51% asked
  37. Climbing Stairs
    MathDynamic ProgrammingMemoization
    Easy51% asked
  38. Clone Graph
    Hash TableDepth-First SearchBreadth-First SearchGraph Theory
    Medium51% asked
  39. Find Peak Element
    ArrayBinary Search
    Medium51% asked
  40. Find the Length of the Longest Common Prefix
    ArrayHash TableStringTrie
    Medium51% asked
  41. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium51% asked
  42. Jump Game
    ArrayDynamic ProgrammingGreedy
    Medium51% asked
  43. Kth Largest Element in an Array
    ArrayDivide and ConquerSortingHeap (Priority Queue)
    Medium51% asked
  44. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium51% asked
  45. Longest Repeating Character Replacement
    Hash TableStringSliding Window
    Medium51% asked
  46. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium51% asked
  47. Merge k Sorted Lists
    Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
    Hard51% asked
  48. Minimum Area Rectangle
    ArrayHash TableMathGeometry
    Medium51% asked
  49. Minimum Swaps to Group All 1's Together II
    ArraySliding Window
    Medium51% asked
  50. Number of Good Leaf Nodes Pairs
    TreeDepth-First SearchBinary Tree
    Medium51% asked
  51. Product of the Last K Numbers
    ArrayMathDesignData Stream
    Medium51% asked
  52. Remove K Digits
    StringStackGreedyMonotonic Stack
    Medium51% asked
  53. Remove Zero Sum Consecutive Nodes from Linked List
    Hash TableLinked List
    Medium51% asked
  54. Reverse Linked List II
    Linked List
    Medium51% asked
  55. Shortest Distance from All Buildings
    ArrayBreadth-First SearchMatrix
    Hard51% asked
  56. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard51% asked
  57. Sort List
    Linked ListTwo PointersDivide and ConquerSorting
    Medium51% asked
  58. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium51% asked
  59. Subsets
    ArrayBacktrackingBit Manipulation
    Medium51% asked
  60. Trapping Rain Water II
    ArrayBreadth-First SearchHeap (Priority Queue)Matrix
    Hard51% asked

These are the 60 most-reported of 64 tracked ByteDance questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in ByteDance's style

Original ZorixOS questions written the way ByteDance interviews, so you rehearse the real format. Not claimed as asked at ByteDance.

  1. Imagine you are building a new feature for TikTok that allows users to collaborate on short videos in real-time, similar to Google Docs but for video editing. Describe the technical challenges you anticipate regarding synchronization, conflict resolution, and handling large media files across potentially millions of concurrent users. Outline your proposed architecture.

    Software EngineerSystem DesignTests: Assesses system design capabilities, distributed systems knowledge, and problem-solving for large-scale applications.

  2. TikTok is experiencing a sudden surge in video upload failures in a specific region. Users report 'upload failed' errors intermittently. How would you approach debugging this issue, considering network latency, server load, and potential regional infrastructure problems?

    Software EngineerDebuggingTests: Evaluates debugging skills, systematic problem-solving, and understanding of network and server issues.

  3. Design a system to detect and flag copyright infringement for music used in TikTok videos at scale. Consider the challenges of identifying exact matches, near matches, and variations in audio. What technologies and algorithms would you consider?

    Software EngineerSystem DesignTests: Tests knowledge of large-scale data processing, algorithms for similarity detection, and content moderation challenges.

  4. You are tasked with optimizing the recommendation algorithm for Douyin (ByteDance's Chinese version of TikTok). The goal is to increase watch time by 15%. Describe how you would set up an A/B test to evaluate a new ranking model. What key metrics would you track, and what potential biases would you need to guard against?

    Software EngineerA/B Testing & MetricsTests: Assesses understanding of experimentation, metric selection, and causal inference in a product context.

  5. ByteDance has a massive dataset of user interactions across its platforms. Describe how you would design a distributed system to process and analyze these logs in near real-time to identify emerging trends or potential misuse. Discuss trade-offs between latency, cost, and accuracy.

    Software EngineerSystem DesignTests: Evaluates ability to design scalable, real-time data processing systems and manage trade-offs.

  6. Consider the challenge of content moderation for a platform like CapCut, which allows for user-generated video editing. How would you design a system to detect and flag potentially harmful or policy-violating content that might be subtly manipulated or masked?

    Software EngineerSystem DesignTests: Tests ability to design robust content moderation systems considering sophisticated manipulation techniques.

72+ more ByteDance-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

Keep exploring

Can you answer these out loud, under ByteDance-style follow-ups?

The ZorixOS AI interviewer runs a ByteDance-tuned mock interview: it asks these kinds of questions, digs into your answers, and scores you against a real hiring bar. Your first one is free.

Start your ByteDance mock interview
ByteDance Interview Questions (2026) | ZorixOS