Top 50 Heap Interview Questions
The most frequently asked Heap questions across all roles and companies, ranked by real interview frequency. Updated daily.
Implement an LRU cache in O(1) average time using a hash table and doubly linked list.
Allianz
ICF
InsuletFind the k most frequent elements in an array using counting and a heap or bucket strategy.
Allegis Group
Delta Electronics Americas
AccentureImplement an O(1) average-time LRU cache with per-entry expiration using a hash map, doubly linked list, and thread-safe access.
Deepgram
NetDocuments
InflectionParse log lines, count error codes with a hash table, and return the 10 most frequent using sorting or a heap.
Squarespace
Tencent
BasetenReturn the k most frequent array values using frequency counting and a bounded min-heap.
Inc.
Walmart
Tech(x)Find the kth largest value in an unsorted array using a selection algorithm or heap.
One
Amazon
22nd Century TechnologiesCompute maximum values for every fixed-size telemetry window using a monotonic deque in O(n) time.
Hewlett Packard Enterprise Development
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Problem At Meta, imagine multiple pre-sorted event streams need to be combined into one ordered feed. Given k sorted singly linked lists, merge them into o...
Meta
Google