amazon 的题目

• AI Assistant Repo Bug-Fix (OA Part 2)
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• Service Shutdown / Topological Sort
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• Drone Delivery on a Hub Ring — Minimum Travel
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• LRU Cache (LC 146)
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• Out-of-Order Package Receiver
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• Package Dependency Installation & Build Order
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• Fulfillment-Center Inventory Transfer
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• Word Segmentation with a Dictionary Helper
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• Employee Total-Cost Object Model
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• Find Median from Data Stream (LC 295)
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• Handwrite Sigmoid, Softmax, and Attention
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• Edit Distance (LC 72) with a Follow-Up Variant
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• Best Time to Buy & Sell Stock — Merged Variants
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• Max-Sum Window over a Compressed Array
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• Concatenated Words (LC 472) — Extended Variant
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• Closest Version Date
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• Maximum Concurrent Processes from Intervals
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• Basic Calculator with Postfix Notation
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• Org-Chart Salary Aggregation
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• Find Conflicting Events
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• Domain Score Accumulation (Reverse Trie)
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• Minimum Bills and Coins for an Amount
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• Detect and Break a Linked-List Cycle
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• Caesar Cipher with Case Preservation
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• Event Filter & Queue Routing Service
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• Message Latency from Send/Receive CSV Logs
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• Find Anagrams in a Character Stream
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• Circular Array — Multi-Query Distance Accumulation
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• Tree Node Relationship — Sibling / Cousin / Other
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• Longest Consecutive Sequence — Adjacent Gap ≤ K
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• Bucket Batching DP (Applied Scientist Phone Screen)
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• Lexicographically Largest String via State Flips
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• Min Errors in 0/1/! Subsequence DP
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• Get Nested Object by Path
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• Clone Linked List with Random + Next Pointer
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• Frequency-Priority Error Code Sort
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• Minimum Range-Add Ops to Non-Decreasing Array
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• Lexicographically Minimal BoxIds via +1/9 Op
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• Recursive Schema Validation
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• In-Flight Movie Pair (Two Sum Variant)
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• Line Intersection Points
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• Music Player with Frequency Priority
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• Smallest Time-Diff Pair Per User (Orders × Ads)
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• Abusive Books in Reading Event Stream
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• Handwritten InfoNCE in PyTorch
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• Merge Two Sorted Arrays In-Place
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• VM Inventory Rental — Heap Simulation
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• Equal-Frequency Block Prefix Count
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• Inventory Allocation by Bid Priority
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• Product Quality Values into Contiguous Blocks
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• Max Money from K Consecutive Bags
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• Minimum Redistribution Cost on a Ring
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• Count Connected Components (Union-Find)
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• Earliest One-Time Visiting User
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• Minimum Replacements to Make Array Contiguous
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• Log Aggregation and Group-By
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• Morse Code Encoder / Decoder with Word-Break
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• Restaurant Waitlist & Table Assignment
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• Core Dump System Design
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• Perishable-Goods Tracking & Location System
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• Playlist / Guide Voting System (OOD)
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• Ride-Hailing System Design (Uber)
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• ML System Design — Search / Ranking / Experimentation
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• Rate Limiter (OOD)
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• Minesweeper Game Design
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• Credit Card System (OOD)
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• Distributed Training Data Pipeline (FAR)
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• Permission Control System Design
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• Pizza / Restaurant System (OOD)
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• Pub-Sub Messaging System (OOD)
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• BQ — Leadership Principles Standard Set
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• BQ — GenAI Usage (How / Failure / Tradeoff)
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• Work Simulation & Work Style Assessment (OA)
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• Transformer / Attention Deep-Dive
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• ML Breadth Orals — Linear / Logistic / Random Forest / Optimizers
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• MLP Compute-vs-Memory Bound Analysis
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• Applied Science Manager Phone Screen — Project Deep-Dive + Leadership BQ
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• Robot Human-Avoidance — Open-Ended Design
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• Paper Read Round (FAR / Premium Loops)
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• Science Application (Ambiguous Problem)
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• LoRA and PEFT Variants
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• RLHF: PPO vs GRPO vs GSPO
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• Minimize Grid Inconvenience by Adding One Delivery Center
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• Group Anagrams
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• Package Dependency Installation Order
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• Top K Slowest Requests from Logs
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• Allocate Limited Inventory by Bid Priority
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• Minimum Cost to Make Equal Values Contiguous
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• K-th Smallest Element in Two Sorted Arrays
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• Track Missing Package IDs in an Out-of-Order Receiving System
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• Build Order for a Target Package
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• Install a Package with Its Dependencies
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• Maximum Total Value in a Fixed-Length Window
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• Meeting Rooms III
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• Meeting Rooms II
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• Meeting Rooms
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• Lowest Common Ancestor of a Binary Tree
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• Keyword List Membership Check
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• Minimum Machines for All Tasks
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• Detect Overlapping Time Intervals
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• Single Element in a Sorted Array
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• Binary Tree Vertical Order Traversal
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• Multi-Player N-by-N Tic-Tac-Toe
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• Top-to-Bottom Reachability and Minimum-Cost Paths in a Binary Grid
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• Priority Job Scheduler with Invocation-Based Cooldown
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• Segment a String into Dictionary Words
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• Find Inventory Donor Fulfillment Centers Within Maximum Hops
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• Build an Autocomplete Search Bar
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• Find Median from Data Stream
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• Minimum Eating Speed
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• Implement Scaled Dot-Product Attention
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• Implement Numerically Stable Softmax
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• Implement the Sigmoid Function
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• Make Equal Product Quality Values Contiguous
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• House Robber II
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• Minimize Maximum Distance by Adding One Colored Source
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• Design an Amazon Locker System
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• Validate Binary Search Tree
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• Regular Expression Matching
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• Stock Trading Profit Calculator
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• Maximum Sum of Fixed-Length Subarray in a Sparse Interval Array
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• Concatenated Words with All Decompositions
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• Path Exists in a Binary Maze
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• Two Sum
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• Valid Parentheses
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• Maximum Number of Running Processes
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• Basic Calculator with Postfix Notation
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• Find the Closest Version by Release Date
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• Implement Trie
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• Topological Sort for Task Scheduling
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• Add Two Numbers II Variant
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• Shortest Path Between Circular Drone Hubs
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• Inventory Allocation
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• Manager With Highest Average Salary Among Reports
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• Merge Intervals
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• Minimize the Maximum Distance to a 1 After Flipping One 0
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• Domain Score Aggregation for Leaf Domains
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• Course Schedule: Can Finish All Courses
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• Minimum Cost to Visit Requested Hubs in a Circular Drone Route
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• Minimum Replacements to Make Every Value Contiguous
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• Minimum Travel Time for Drone Deliveries on a Circular Hub Route
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• Social Network Best-Friend Recommendation
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• Course Schedule
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• Top K Frequent Elements
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• Event Filtering and Queue Routing Service
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• Debug a Movie DB Watchlist Full-Stack Project
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• Trapping Rain Water
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• Implement a HashMap Without Built-in Libraries
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• Online Review Content Moderation
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• Minimum Redistribution Cost in Circular Warehouses
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• Course Schedule Variant (Topological Sort)
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• From logs, find the most frequent event sequence
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• Design an index to find sentences by word; support deletion and updates
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• BFS on grid/graph (LC-style)
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• Word Search (LeetCode 79)
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• Calculating Message Latency from Two CSV Logs
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• Replace tokens in a string using delimiter-based key-value rules
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• Max Money From k Consecutive Bags With Piecewise-Constant Segments
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• Merge time intervals from multiple detectors
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• Detect duplicates / near-duplicates in streaming events
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• Find All Target Anagrams in a Character Stream (Sliding Window)
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• Course Schedule Conflict Check and Ordering (Topological Sort)
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• Merge Products into Categories (Union-Find / Connected Components)
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• Count connected components in an undirected graph (Union-Find)
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• Full-Stack Bug Fix: Recommendations Not Showing on User Home Page (MovieDB)
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• Minimum Total Travel Time on a Circular Hub Ring
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• Minimum Conflicts in Merging Two Branches
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• Design a Robot Human-Avoidance Navigation System (High-Level Pseudocode + Architecture)
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• Circular Array Shortest Path Sum over Multiple Queries
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• Longest Near-Consecutive Sequence (Adjacent Difference < k)
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• Determine Relationship Between Two Nodes in a Tree (Siblings / Cousins / Other)
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• Student Printing Queue: Enumerate All Valid Printing Orders (Queue to Ring Variant)
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• Grid BFS: Minimum steps in a 2D matrix (simplified interview variant)
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• Implement an LRU Cache
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• Optimal Bucket Batching to Minimize Padding (DP)
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• Rotate Square Matrix by 90 Degrees
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• LRU Cache (Design with Doubly Linked List + Hash Map)
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• Meeting Rooms II
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• Meeting Rooms
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• Multi-source BFS (problem statement missing)
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• Maximum Alternating Subsequence Sum
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• Employee Importance
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• SQL Interview Questions (Window Functions and CTE)
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• Merge Two Sorted Linked Lists
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• SQL: Window Function to Rank Within Group
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• SQL: Use LEFT JOIN to Find Missing Relationships
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• Construct Lexicographically Largest Sequence with Unlocking State
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• Design a Per-User Rate Limiter (Accept/Reject Requests)
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• Earliest User Who Logged In Exactly Once
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• Max Consecutive ON Servers
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• Decode Morse Code with Word Separator Only (All Possible Decodings)
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• Decode Morse Code with Word and Character Separators
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• DP / State Compression / Memoization (exact problem id unknown)
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• Backtracking / Grid Search (exact problem id unknown)
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• Minimum global-replace operations to make all values form contiguous blocks
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• Minimum Cost to Convert All 1s to 0s with Fixed-Length Window Operations
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• Maximize Protected Population with One-Step Left Relocation
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• Implement get(object, path) for nested Map/Array access
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• Object-Oriented Design: Design a Credit Card System
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• Hash Map Easy + Medium Follow-up (exact statement missing)
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• DFS Variant Coding Problem (exact statement missing)
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• Build a BFS Web Crawler with Robust Retry and URL Normalization
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• Sum of Positive Differences (Greedy One-Pass)
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• Sort Elements by Frequency
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• Minimum Emergency Restock Days Under Inventory Bounds with Checkpoints
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• Greedy Removal of Minimum with Neighbor Deletions (Heap + Lazy Deletion)
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• Hash Table Easy Question (not specified)
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• Object-Oriented Design (OOD) Question (scenario not specified)
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• Topological Sort for Course Ordering (Course Schedule II-like)
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• Diagonal Nearest Unvisited Redirect Simulation
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• Max Protected Population After One-Step Left Relocation
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• Hash Table Lookup with Simple Follow-ups
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• Topological Ordering for Course Prerequisites
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• Package Delivery (details unknown)
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• Number of Islands
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• Median Rating of Most Recent N Comments
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• Deduplicate Events List (with Sorting + Map/Stack)
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• For each prefix, check if the whole string can be partitioned into blocks with identical letter-frequency signature
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• Repeat N operations: add min+max, then decrement max
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• Copy Linked List with Random and Extra Pointer
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• Random Pick with Weight
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• In-place Array Reordering (0/1/2 sort variant)
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• Simplified Top-K
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• Minimum Total Increment to Make Array Non-decreasing (Range Increment Operations)
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• Sort Error Codes by Increasing Frequency (tie by smaller value)
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• Optimize Box IDs to Lexicographically Minimum String
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• Recursive Schema Validation for JSON-like Data
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• Morse Code Encoder/Decoder with Dictionary-Based Segmentation
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• Online Assessment (LeetCode-style)
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• Affected Services After Shutting Down Dependencies (Topological Order)
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• Topological Sort / Dependency Resolution
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• Music Player: Play Most Frequent Unplayed Songs with Round Reset
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• Max protected population by moving guards left at most once
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• Count errors from subsequence pairs after replacing wildcards
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• All Valid Sentences by Inserting Spaces (Word Break II)
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• Count Unique Morse Translations
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• Amazon NG OA Coding: 100-min (1 LeetCode-style problem + 1 AI-related coding task)
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• Per-User Minimum Time Difference Between Orders and Ads Events (Two Sorted Lists)
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• Count Distinct Profit Pairs That Sum to Target
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• Maximize Completed Tasks with Additional Time (Greedy by Remaining Time)
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• In-place merge of two sorted arrays (arr2 into arr1)
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• Fruit Into Baskets (Sliding Window variant)
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• Longest Mountain in Array (or Valid Mountain Array variant)
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• Binary Tree Level Average (Level-order traversal)
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• Word Break: Return All Possible Sentences
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• Count Unique Morse Code Transformations
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• Prefix Equal-Frequency Block Partition Count
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• Max-Inventory Rental Revenue (Repeatedly Pick Current Maximum)
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• Maximize Protected Population with One-Step-Left Move Units
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• VM Rental Revenue
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• Package Delivery System
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• Modified OA with AI assisted debugging
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• Print Every Odd Number from a List
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• Inheritance Example with Method Override
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• Minimum Groups with Max Difference Constraint
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• First Non-Repeating Character in a String
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• Coding: Backtracking Algorithm
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• Machine Learning Coding: Reproduce a New Paper Experiment
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• Get Maximum Median
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• Determine Optimal Samples
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• System Design for Package Installer with Dependency Resolution
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• Amazon Training Courses Catalog Validation Function: Detecting Cycles
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• K Highest Probability Winners in Lottery System
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• Serialize and Deserialize Binary Tree
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• Tracing and Profiling: Stack Trace and Instruction Register Expansion
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• Vectored Computation Optimization for Asymmetric Cores
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• Implement memcpy with misaligned blocks
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• Design a Distributed Temperature Sensor System
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• Design a Weighted Random Value Generator
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• Product of Array Except Self
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• Minimize Increments for Non-Decreasing Order
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• Maximize Memory Capacity
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• Merge Intervals
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• Maximum Primary Memory Sum
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• Minimum Operations to Make Array Non-decreasing
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• Wet Points in 2D Terrain
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• Lowest Common Ancestor of a Binary Tree
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• Longest Substring Without Repeating Characters
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• Sum to the Target
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• Shortest Distance Between Two Islands
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• Maximum Memory in Region A
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• Maximum System Memory Capacity
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• Island Counter
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• Find the Kth Largest Element
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• Graph Problem Similar to Leetcode 207
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• Path Output Starting from Any Node
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• Implement GPT Model
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• LFU Cache Design
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• Server Request
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• Multi-source BFS
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• URL Access Table Pathfinding
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• Friend Purchase Recommendation
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• Reusable Dialog Component
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• Game Shop Design
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• IP CIDR Firewall Filtering
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• Minimize Inventory Price Adjustments
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• Optimize Data Flow in Processing Nodes
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• Maximize System Memory Capacity
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• Validate Items Edge in a Directed Graph
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• Top K Frequent Elements
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• Merge Intervals
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• Constant Folding in Query Tree
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• Layer Problem Implementation
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• Encoding and Decoding using Run-length Encoding and Bin Packing
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• Lazy Array
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• Top K Pages by Click Count
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• Random Playlist Generator with Constraints
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• Number of Digit One
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• Maxdiff Value of Connected Components in Graph
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• Memory Size Calculation for DDN Model Structure
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• Implement Linear Regression with Backpropagation
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• Wishlist and Load More with JavaScript
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• Validate Form and Append to Table
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• Maximum Affinity Distribution
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• Function Inclusive and Exclusive Time Calculation
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• Decode Morse Code
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• Design Package Notification System
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• Find Index of K in Array with Unknown Length
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• Best Time to Buy and Sell Stock
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• Camera API Design
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• Balance Subsequence
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• Design a Card Class
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• Shipping Cost Calculation
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• Maximum Subarray
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• Group Students
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• Max Subjects Number
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• Mutation Removal in Genome
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• Lexicographically Smallest Special String
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• Design a Parking Lot System
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• Python Scene Problem
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• CPU Credit Calculation
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• Longest Substring Without Repeating Characters
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• Minimum Time for Irrecoverable Password
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• Minimum Machines for Same Efficiency
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• Log Processing to Detect Anomalies
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• Implement LRU Cache
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• Frequent K Elements and One Linear Scan
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• PreSum Based Coding Problem
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• Best Time to Buy and Sell Stock
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• Rotting Oranges
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• Longest Happy String
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• Reorganize String
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• Days Until Today Calculator
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• Word Search with Modifications
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• Longest Subarray with Target Sum
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• Maximal Total Value of Groups
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• Clean Code Algorithm
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• Maximum Volume of Non-overlapping Tasks
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• Minimum Rounds for Substrings with Special Character
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• Movie Recommendation System
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• Minimize Cost for Distinct Sizes
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• String Compression
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• Convert Integer to Roman Numeral
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• Find Longest Regex
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• Game Minimum Health
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• Check If Two Strings Are Anagrams
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• Swap Two Numbers Without a Third Variable
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• Minimize integer via operations
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• Count of Top Ranked Customers
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• Remove Border Islands
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• Longest Path in Directed Acyclic Graph
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• Implement a Delivery and Collection Algorithm
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• LRU Cache
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• Arrange Array for Maximum Index of Non-Positive Prefix Sum
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• DNA Similarity
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• Shortest Word Distance
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• Course Schedule Challenges
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• Course Schedule II
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• Manage Party Playlist with Person and Party Classes
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• Satisfy Event Schema
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• Optimize Maintenance and Labor Planning
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• Maximum Number of Indices with arr[i] < arr[i+1]
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• Course Schedule Problem
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• Best Time to Buy and Sell Stock
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• Depth-First Search Similar Problem
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• Search Value in Rotated Sorted List
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• Pizza Slices Calculator Program
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• User Access Website
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• Add and Search Word Design
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• Find Duplicates in Integer List
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• Filter Top Daily Sales Rows by Category
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• Minimal Cost to Make Sizes Distinct
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• Possible Survivors in Competitive Inventory Processes
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• Top K Frequent Words in a File
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• Maximize Minimal Element of Inventory
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• Find Median in Subsequences
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• Maximum System Throughput
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• Binary Tree Encoding and Decoding
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• Non-Zero Load Sum
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• Group Anagrams
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• Find the Maximum Element in an Array
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• Path In Zigzag Labelled Sequence
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• Convert Array to Non-decreasing Array by Adding x
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• Find Continuous Subarray with Identical Elements
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• Lexicographically Smallest String with Increment Operations
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• Minimum Insertions to Avoid Zero Sum Subarray
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• Minimize String with Insert Operation
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• Count Number of Packages
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• Machine Learning and Traditional Models
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• Bird Collects Sticks
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• Pivot Compare
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• Odd Frequency Linked List
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• Word Search II Solution Explanation
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• 1. Pascal Tangent Encryption for Odd-Positioned Digits 2. Counting Matching D-Length Substrings Between Strings
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