Heap Priority Queue Interview Questions

Math Graph Heap (Priority Queue)Number Theory Shortest Path

Rank

#295HardFrequency: 100%

Find Median from Data Stream

Asked at PayPal

Two Pointers Design Sorting Heap (Priority Queue)Data Stream

Rank

#658MediumFrequency: 96%

Find K Closest Elements

Array Two Pointers Binary Search Sliding Window Sorting Heap (Priority Queue)

Rank

#215MediumFrequency: 92%

Kth Largest Element in an Array

Array Divide and Conquer Sorting Heap (Priority Queue)Quickselect

Rank

#1478MediumFrequency: 87%

Maximum Number of Events That Can Be Attended

Asked at Oracle

Array Greedy Sorting Heap (Priority Queue)

Rank

#621MediumFrequency: 85%

Task Scheduler

Array Hash Table Greedy Sorting Heap (Priority Queue)Counting

Rank

#347MediumFrequency: 76%

Top K Frequent Elements

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

Rank

#1397MediumFrequency: 73%

Search Suggestions System

Array String Binary Search Trie Sorting Heap (Priority Queue)

Rank

#778MediumFrequency: 72%

Reorganize String

Hash Table String Greedy Sorting Heap (Priority Queue)Counting

Rank

#3710HardFrequency: 72%

Design an Array Statistics Tracker

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

#10

Rank

#23HardFrequency: 72%

Merge k Sorted Lists

Linked List Divide and Conquer Heap (Priority Queue)Merge Sort

#11

Rank

#1014MediumFrequency: 68%

K Closest Points to Origin

Array Math Divide and Conquer Geometry Sorting Heap (Priority Queue)Quickselect

#12

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

#13

Rank

#2267HardFrequency: 64%

Minimum Difference in Sums After Removal of Elements

Array Dynamic Programming Heap (Priority Queue)

#14

Rank

#1549MediumFrequency: 63%

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Asked at Uber

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#15

Rank

#253MediumFrequency: 62%

Meeting Rooms II

Asked at TikTok

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

#16

Rank

#2868MediumFrequency: 60%

Continuous Subarrays

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#17

Rank

#2164MediumFrequency: 56%

Two Best Non-Overlapping Events

Array Binary Search Dynamic Programming Sorting Heap (Priority Queue)

#18

Rank

#2711HardFrequency: 55%

Minimum Time to Visit a Cell In a Grid

Array Breadth-First Search Graph Heap (Priority Queue)Matrix Shortest Path

#19

Rank

#3555EasyFrequency: 55%

Final Array State After K Multiplication Operations I

Array Math Heap (Priority Queue)Simulation

#20

Rank

#2300MediumFrequency: 53%

Construct String With Repeat Limit

Hash Table String Greedy Heap (Priority Queue)Counting

#21

Rank

#2692EasyFrequency: 48%

Take Gifts From the Richest Pile

Array Heap (Priority Queue)Simulation

#22

Rank

#239HardFrequency: 45%

Sliding Window Maximum

Array Queue Sliding Window Heap (Priority Queue)Monotonic Queue

#23

Rank

#373MediumFrequency: 45%

Find K Pairs with Smallest Sums

Array Heap (Priority Queue)

#24

Rank

#378MediumFrequency: 37%

Kth Smallest Element in a Sorted Matrix

Array Binary Search Sorting Heap (Priority Queue)Matrix

#25

Rank

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Heap Priority Queue Interview Questions

Master 25 heap priority queue problems frequently asked in technical interviews. These questions test your understanding of heap priority queueconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Digit Operations to Make Two Integers Equal

Math Graph Heap (Priority Queue)Number Theory Shortest Path

Rank

#295HardFrequency: 100%

Find Median from Data Stream

Asked at PayPal

Two Pointers Design Sorting Heap (Priority Queue)Data Stream

Rank

#658MediumFrequency: 96%

Find K Closest Elements

Array Two Pointers Binary Search Sliding Window Sorting Heap (Priority Queue)

Rank

#215MediumFrequency: 92%

Kth Largest Element in an Array

Array Divide and Conquer Sorting Heap (Priority Queue)Quickselect

Rank

#1478MediumFrequency: 87%

Maximum Number of Events That Can Be Attended

Asked at Oracle

Array Greedy Sorting Heap (Priority Queue)

Rank

#621MediumFrequency: 85%

Task Scheduler

Array Hash Table Greedy Sorting Heap (Priority Queue)Counting

Rank

#347MediumFrequency: 76%

Top K Frequent Elements

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

Rank

#1397MediumFrequency: 73%

Search Suggestions System

Array String Binary Search Trie Sorting Heap (Priority Queue)

Rank

#778MediumFrequency: 72%

Reorganize String

Hash Table String Greedy Sorting Heap (Priority Queue)Counting

Rank

#3710HardFrequency: 72%

Design an Array Statistics Tracker

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

#10

Rank

#23HardFrequency: 72%

Merge k Sorted Lists

Linked List Divide and Conquer Heap (Priority Queue)Merge Sort

#11

Rank

#1014MediumFrequency: 68%

K Closest Points to Origin

Array Math Divide and Conquer Geometry Sorting Heap (Priority Queue)Quickselect

#12

Rank

#3647MediumFrequency: 67%

Zero Array Transformation III

Array Greedy Sorting Heap (Priority Queue)Prefix Sum

#13

Rank

#2267HardFrequency: 64%

Minimum Difference in Sums After Removal of Elements

Array Dynamic Programming Heap (Priority Queue)

#14

Rank

#1549MediumFrequency: 63%

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Asked at Uber

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#15

Rank

#253MediumFrequency: 62%

Meeting Rooms II

Asked at TikTok

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

#16

Rank

#2868MediumFrequency: 60%

Continuous Subarrays

Array Queue Sliding Window Heap (Priority Queue)Ordered Set Monotonic Queue

#17

Rank

#2164MediumFrequency: 56%

Two Best Non-Overlapping Events

Array Binary Search Dynamic Programming Sorting Heap (Priority Queue)

#18

Rank

#2711HardFrequency: 55%

Minimum Time to Visit a Cell In a Grid

Array Breadth-First Search Graph Heap (Priority Queue)Matrix Shortest Path

#19

Rank

#3555EasyFrequency: 55%

Final Array State After K Multiplication Operations I

Array Math Heap (Priority Queue)Simulation

#20

Rank

#2300MediumFrequency: 53%

Construct String With Repeat Limit

Hash Table String Greedy Heap (Priority Queue)Counting

#21

Rank

#2692EasyFrequency: 48%

Take Gifts From the Richest Pile

Array Heap (Priority Queue)Simulation

#22

Rank

#239HardFrequency: 45%

Sliding Window Maximum

Array Queue Sliding Window Heap (Priority Queue)Monotonic Queue

#23

Rank

#373MediumFrequency: 45%

Find K Pairs with Smallest Sums

Array Heap (Priority Queue)

#24

Rank

#378MediumFrequency: 37%

Kth Smallest Element in a Sorted Matrix