Prefix Sum Interview Questions

Array Math Binary Search Prefix Sum Randomized

Rank

#238MediumFrequency: 87%

Product of Array Except Self

Asked at Oracle

Rank

#560MediumFrequency: 81%

Subarray Sum Equals K

Rank

#1783MediumFrequency: 73%

Ways to Make a Fair Array

Asked at DoorDash

Rank

#3639MediumFrequency: 67%

Zero Array Transformation I

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

Rank

#253MediumFrequency: 62%

Meeting Rooms II

Asked at TikTok

Array Two Pointers Greedy Sorting Heap (Priority Queue)Prefix Sum

Rank

#3643MediumFrequency: 48%

Zero Array Transformation II

Array Binary Search Prefix Sum

Rank

#3410HardFrequency: 45%

Find Longest Self-Contained Substring

Asked at Amazon

Hash Table String Binary Search Prefix Sum

#10

Rank

#325MediumFrequency: 43%

Maximum Size Subarray Sum Equals k

#11

Rank

#523MediumFrequency: 43%

Continuous Subarray Sum

Array Hash Table Math Prefix Sum

#12

Rank

#410HardFrequency: 42%

Split Array Largest Sum

Array Binary Search Dynamic Programming Greedy Prefix Sum

#13

Rank

#1966MediumFrequency: 42%

Frequency of the Most Frequent Element

Array Binary Search Greedy Sliding Window Sorting Prefix Sum

#14

Rank

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Prefix Sum Interview Questions

Master 14 prefix sum problems frequently asked in technical interviews. These questions test your understanding of prefix sumconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Max Consecutive Ones III

Asked at LinkedIn

Array Binary Search Sliding Window Prefix Sum

Rank

#912MediumFrequency: 87%

Random Pick with Weight

Array Math Binary Search Prefix Sum Randomized

Rank

#238MediumFrequency: 87%

Product of Array Except Self

Asked at Oracle

Rank

#560MediumFrequency: 81%

Subarray Sum Equals K

Rank

#1783MediumFrequency: 73%

Ways to Make a Fair Array

Asked at DoorDash

Rank

#3639MediumFrequency: 67%

Zero Array Transformation I

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

Rank

#253MediumFrequency: 62%

Meeting Rooms II

Asked at TikTok

Array Two Pointers Greedy Sorting Heap (Priority Queue)Prefix Sum

Rank

#3643MediumFrequency: 48%

Zero Array Transformation II

Array Binary Search Prefix Sum

Rank

#3410HardFrequency: 45%

Find Longest Self-Contained Substring

Asked at Amazon

Hash Table String Binary Search Prefix Sum

#10

Rank

#325MediumFrequency: 43%

Maximum Size Subarray Sum Equals k

#11

Rank

#523MediumFrequency: 43%

Continuous Subarray Sum

Array Hash Table Math Prefix Sum

#12

Rank

#410HardFrequency: 42%

Split Array Largest Sum

Array Binary Search Dynamic Programming Greedy Prefix Sum

#13

Rank

#1966MediumFrequency: 42%

Frequency of the Most Frequent Element