Counting Interview Questions

Master 10 counting problems frequently asked in technical interviews. These questions test your understanding of countingconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Identify the Largest Outlier in an Array

Asked at Amazon

Array Hash Table Counting Enumeration

Rank

#621MediumFrequency: 85%

Task Scheduler

Asked at Amazon

Array Hash Table Greedy Sorting Heap (Priority Queue)Counting

Rank

#387EasyFrequency: 83%

First Unique Character in a String

Asked at Oracle

Hash Table String Queue Counting

Rank

#347MediumFrequency: 76%

Top K Frequent Elements

Asked at Meta

Array Hash Table Divide and Conquer Sorting Heap (Priority Queue)Bucket Sort Counting Quickselect

Rank

#778MediumFrequency: 72%

Reorganize String

Asked at Amazon

Hash Table String Greedy Sorting Heap (Priority Queue)Counting

Rank

#383EasyFrequency: 72%

Ransom Note

Asked at Airbnb

Hash Table String Counting

Rank

#2532EasyFrequency: 71%

Remove Letter To Equalize Frequency

Asked at Salesforce

Hash Table String Counting

Rank

#2300MediumFrequency: 59%

Construct String With Repeat Limit

Asked at Flipkart

Hash Table String Greedy Heap (Priority Queue)Counting

Rank

#169EasyFrequency: 55%

Majority Element

Asked at Microsoft

Array Hash Table Divide and Conquer Sorting Counting

Rank

#1034HardFrequency: 50%

Subarrays with K Different Integers

Asked at DoorDash

Array Hash Table Sliding Window Counting

#10

Rank

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Counting Interview Questions

Master 10 counting problems frequently asked in technical interviews. These questions test your understanding of countingconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard