Counting Interview Questions

Master 11 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

#3638HardFrequency: 100%

Minimum Operations to Make Character Frequencies Equal

Asked at TikTok

Hash Table String Dynamic Programming Counting Enumeration

Rank

#621MediumFrequency: 85%

Task Scheduler

Asked at Amazon

Array Hash Table Greedy Sorting Heap (Priority 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

#1915EasyFrequency: 73%

Check if One String Swap Can Make Strings Equal

Asked at DoorDash

Hash Table String Counting

Rank

#778MediumFrequency: 72%

Reorganize String

Asked at Amazon

Hash Table String Greedy Sorting Heap (Priority Queue)Counting

Rank

#169EasyFrequency: 55%

Majority Element

Asked at Microsoft

Array Hash Table Divide and Conquer Sorting Counting

Rank

#2300MediumFrequency: 53%

Construct String With Repeat Limit

Asked at Google

Hash Table String Greedy Heap (Priority Queue)Counting

Rank

#387EasyFrequency: 51%

First Unique Character in a String

Asked at Amazon

Hash Table String Queue Counting

Rank

#1034HardFrequency: 45%

Subarrays with K Different Integers

Asked at Amazon

Array Hash Table Sliding Window Counting

#10

Rank

#383EasyFrequency: 42%

Ransom Note

Asked at Google

Hash Table String Counting

#11

Rank

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Counting Interview Questions

Related Topics

Identify the Largest Outlier in an Array

Minimum Operations to Make Character Frequencies Equal

Task Scheduler

Top K Frequent Elements

Check if One String Swap Can Make Strings Equal

Reorganize String

Majority Element

Construct String With Repeat Limit

First Unique Character in a String

Subarrays with K Different Integers

Ransom Note

Master Counting in Real Interviews