Top 50 deduplication Interview Questions
The most frequently asked deduplication questions across all roles and companies, ranked by real interview frequency. Updated daily.
Remove duplicate language names while preserving the order in which they were provided.
Brickred Systems
RTX
RenderFind all unique zero-sum triplets by sorting the array and applying two pointers in O(n²) time.
SaviyntIISS STOXXGGoHighLevelUse a hash set to find each duplicated array value once in O(n) time.
Automatic Data Processing
ADP
Arrow InternationalUse a sliding window and hash map to find the longest substring with no repeated characters in O(n) time.
Prime VideoTTestMu AIBuild an LRU cache that reuses exact or semantically similar LLM responses while enforcing TTL and relevance thresholds.
FactsetRemove repeated values from a Samsung Semiconductor linked list in place using a runner pointer and constant extra space.
Samsung Semiconductor
Impact Recruitment Group
Rakuten AdvertisingRemove duplicate values from an array while preserving the order of their first occurrences.
Realpage
BirlasoftCCEVASign up to see every question
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Identify duplicate transaction rows, retain the earliest record, and delete later duplicates safely.
Oracle
Amex
Brooksource