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Amazon

Challenges: 27Easy: 6Medium: 15Hard: 6

This Amazon coding interview set pulls together 27 challenges, with a mix of 6 easy, 15 medium, 6 hard. The problems lean on arrays, sliding-window, bfs, trees, dynamic-programming, so you can drill the patterns that come up most and walk into the interview ready.

Topics this company tests

Amazon coding challenges

  • Best Time to Buy and Sell Stock

    Difficulty: EasyTopics: arrays, sliding-window

  • Binary Tree Level Order Traversal

    Difficulty: MediumTopics: bfs, trees

  • Cache Invalidation Planner

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

  • Container With Most Water

    Difficulty: MediumTopics: arrays, two-pointers

  • Contains Duplicate

    Difficulty: EasyTopics: arrays, hashing

  • Cyclic Dependency Detector

    Difficulty: MediumTopics: dfs, graphs, topological-sort

  • Group Anagrams

    Difficulty: MediumTopics: hashing, strings

  • Longest Increasing Subsequence

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

  • Longest Substring Without Repeating Characters

    Difficulty: MediumTopics: hashing, sliding-window, strings

  • Maximum Depth of Binary Tree

    Difficulty: MediumTopics: bfs, recursion, trees

  • 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

  • Merge Two Sorted Lists

    Difficulty: EasyTopics: linked-lists

  • Min Stack

    Difficulty: MediumTopics: design, stacks

  • Multi Tenant Quota Enforcer

    Difficulty: MediumTopics: hash-map, simulation

  • Product of Array Except Self

    Difficulty: MediumTopics: arrays

  • Retry Backoff Scheduler

    Difficulty: MediumTopics: math, simulation

  • Reverse Linked List

    Difficulty: EasyTopics: linked-lists

  • Three Sum

    Difficulty: MediumTopics: arrays, sorting, two-pointers

  • Trapping Rain Water

    Difficulty: HardTopics: arrays, stacks, two-pointers

  • Two Sum

    Difficulty: EasyTopics: arrays, hashing

  • Valid Parentheses

    Difficulty: EasyTopics: stacks, strings

  • Validate Binary Search Tree

    Difficulty: MediumTopics: binary-search, recursion, trees

  • Wallet Reconciliation

    Difficulty: HardTopics: data-integrity, hash-map

  • Warehouse Slot Packing

    Difficulty: MediumTopics: greedy, sorting, two-pointers

  • Word Break

    Difficulty: HardTopics: dynamic-programming, strings

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