Data Stream Interview Questions

Master 22 data stream problems frequently asked in technical interviews. These questions test your understanding of data streamconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Design Hit Counter

Asked at Databricks

Array Binary Search Design Queue Data Stream

Rank

#1366MediumFrequency: 83.2%

First Unique Number

Asked at Uber

Array Hash Table Design Queue Data Stream

Rank

#346EasyFrequency: 73.1%

Moving Average from Data Stream

Asked at Meta

Array Design Queue Data Stream

Rank

#295HardFrequency: 66.4%

Find Median from Data Stream

Asked at PayPal

Two Pointers Design Sorting Heap (Priority Queue)Data Stream

Rank

#969EasyFrequency: 63.3%

Number of Recent Calls

Asked at Databricks

Design Queue Data Stream

Rank

#359EasyFrequency: 52.3%

Logger Rate Limiter

Asked at Google

Hash Table Design Data Stream

Rank

#937MediumFrequency: 45.8%

Online Stock Span

Asked at Microsoft

Stack Design Monotonic Stack Data Stream

Rank

#170EasyFrequency: 44.7%

Two Sum III - Data structure design

Asked at LinkedIn

Array Hash Table Two Pointers Design Data Stream

Rank

#789EasyFrequency: 40.8%

Kth Largest Element in a Stream

Asked at Amazon

Tree Design Binary Search Tree Heap (Priority Queue)Binary Tree Data Stream

Rank

#1953HardFrequency: 39.5%

Finding MK Average

Asked at Google

Design Queue Heap (Priority Queue)Data Stream Ordered Set Treap

#10

Rank

#642HardFrequency: 39.1%

Design Search Autocomplete System

Asked at TikTok

String Depth-First Search Design Trie Sorting Heap (Priority Queue)Data Stream

#11

Rank

#1477MediumFrequency: 33%

Product of the Last K Numbers

Asked at TikTok

Array Math Design Data Stream Prefix Sum

#12

Rank

#2139MediumFrequency: 31.1%

Detect Squares

Asked at Google

Array Hash Table Design Counting Data Stream

#13

Rank

#1582MediumFrequency: 29.5%

Design Browser History

Asked at Apple

Array Linked List Stack Design Doubly-Linked List Data Stream

#14

Rank

#2161MediumFrequency: 25.4%

Stock Price Fluctuation

Asked at Google

Hash Table Design Heap (Priority Queue)Data Stream Ordered Set

#15

Rank

#3710HardFrequency: 25.1%

Design an Array Statistics Tracker

Asked at Amazon

Hash Table Binary Search Design Queue Heap (Priority Queue)Data Stream Ordered Set

#16

Rank

#1097HardFrequency: 22.1%

Stream of Characters

Asked at Google

Array String Design Trie Data Stream Aho–Corasick Algorithm

#17

Rank

#4118MediumFrequency: 21.5%

Design Ride Sharing System

Asked at Meta

Hash Table Design Queue Data Stream

#18

Rank

#1767MediumFrequency: 20%

Design Front Middle Back Queue

Asked at Amazon

Array Linked List Design Queue Doubly-Linked List Data Stream

#19

Rank

#2207HardFrequency: 20%

Sequentially Ordinal Rank Tracker

Asked at Amazon

Design Heap (Priority Queue)Data Stream Ordered Set

#20

Rank

#352HardFrequency: 8.1%

Data Stream as Disjoint Intervals

Asked at Google

Hash Table Binary Search Union-Find Design Data Stream Ordered Set

#21

Rank

#1775EasyFrequency: 5%

Design an Ordered Stream

Asked at Meta

Array Hash Table Design Data Stream

#22

Rank

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Data Stream Interview Questions

Master 22 data stream problems frequently asked in technical interviews. These questions test your understanding of data streamconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard