Top 50 Sorting Interview Questions
The most frequently asked Sorting questions across all roles and companies, ranked by real interview frequency. Updated daily.
Merge two sorted arrays into one sorted array using a two-pointer linear scan.
Dropbox
TetraScience
BookingUse a hash map to find two array elements that sum to a target in O(n) time.
NeoDoctoCCredibleMerge two sorted singly linked lists into one sorted list by relinking existing nodes.
NeoDocto
Otter
SimplImplement an LRU cache using a hash map and doubly linked list to support O(1) get and put operations.
Scout Motors
Twitch
AllianzOptimize repeated range-sum computations with prefix sums instead of rescanning application workload data.
University of Florida
Cybertrend Engineering
Diamond FoundrySort intervals by start time, then merge overlapping ranges into a minimal non-overlapping list.
Anthropic
Justworks
ZendeskSort an array using merge sort and analyze its time and space complexity.
Apexon
Evernote
Huron Consulting GroupSign up to see every question
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Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.
eClinicalWorksNNeenOpal Canada
InformaticaRetrieve the second value from a column using a defined row ordering.
eClinicalWorksReturn the complete encounter row with the highest non-NULL visit count, using deterministic ordering for ties.
eClinicalWorks