Hash Table Interview Questions
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coding
Adobe
Google
Amazon
Adobe Coding Question: Shortest Subarray with K Distinct
Shortest contiguous subarray with exactly k distinct integers. Learn sliding-window + hash-map approach, edge cases, and practical tips — practice now.
Machine Learning Engineer, Software EngineerEntry Level
coding
ByteDance
TikTok
Google
ByteDance Coding Question: Merge Accounts by Email
Practice ByteDance 'Merge Accounts by Email' coding problem using Union-Find or graph traversal. Implement merging, dedupe emails, sort results, and analyze complexity.
Software Engineer, Backend EngineerEntry Level
coding
Google
Microsoft
Meta
Google Coding Question: Online Longest Subarray with Average
Track longest contiguous subarray with average S online. Use prefix-sum key = pref - S*i with a hashmap. Read precision tips and complexity notes.
Machine Learning Engineer, Software EngineerEntry Level
coding
LinkedIn
Google
Meta
LinkedIn T9 Coding Question: Phone-Keyboard Word Match
T9 phone-keypad matching: return dictionary words matching a digit string per position (case-insensitive). Includes precompute index and query API design.
Software Engineer, Backend EngineerEntry Level
coding
Oracle
Amazon
Google
LRU Cache Implementation - Oracle Coding Interview
Implement an O(1) LRU cache with get/put, fixed-capacity eviction, and Java follow-ups (collections choices, thread-safety, GC, equals/hashCode). Read tips.
Software Engineer, Backend EngineerEntry Level
coding
Salesforce
Amazon
Google
Salesforce Coding: Left-Right Occurrence Binary Strings
Salesforce coding: build left/right occurrence binary strings for an integer array. Learn hash-table two-pass solutions, time/space tradeoffs and follow-up ideas.
Software Engineer, Backend EngineerEntry Level
coding
Stripe
PayPal
Square
Stripe Coding Interview: Match Payments to Invoices
Deterministic matching of payments to invoices using identifier, exact, then range rules. Tie-breakers and earliest due-date ordering for stable results.
Software Engineer, Backend EngineerEntry Level
online assessment
Stripe
Cloudflare
Dropbox
Stripe Load Balancer WebSocket Router (Online Assessment)
Simulate Stripe's WebSocket load balancer handling CONNECT/DISCONNECT/SHUTDOWN with sticky routing, eviction, and reallocation. Read algorithmic tips & examples.
Software Engineer, Backend EngineerEntry Level
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