Top 50 Problems on Heap Data Structure asked in SDE Interviews

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A Heap is a special Tree-based Data Structure in which the tree is a complete binary tree. Generally, heaps are of two types: Max-Heap and Min-Heap. To know more about this Data Structure in-depth refer to the Tutorial on Heap Data-Structure.

Given below are the most frequently asked interview questions on Heaps:

Easy Interview Questions on Heap Data Structure
Kth smallest element in an array
Minimum product of k integers in an array of positive Integers
Sort an Almost Sorted Array
Top K Frequent Elements
Height of a complete binary tree (or Heap) with N nodes
Minimum sum of two numbers formed from digits of an array
Kth smallest element in a row-wise and column-wise sorted 2D array
Sum of all elements between k1’th and k2’th smallest elements

Medium Interview Questions on Heap Data Structure
Implement a Min Heap
Implement a Max Heap
Heap Sort
Convert max heap to min heap
Convert min Heap to max Heap
Check if a Binary Tree is a Min Heap
Check if a Binary Tree is a Max Heap
Binary Heap
Given level order traversal of a Binary Tree, check if the Tree is a Min-Heap
Implement a priority queue
How to implement Priority Queue – using Heap or Array?
Heap Sort for decreasing order using min heap
Find kth smallest element in a row-column sorted matrix
Largest triplet product in a stream
Connect n ropes with minimum cost
Merge two binary max heaps
Find k closest numbers
Sort an almost sorted array
K maximum sum combinations from two arrays
BST to max heap
Convert BST to Min Heap
K’th largest element in a stream
Find k numbers with most occurrences in the given array
Find the kth largest element in an array
Merge overlapping intervals
Game with String
Nearly sorted
Maximize The Array
Rearrange characters
Minimum sum of squares of character counts in a given string after removing k characters
Maximum sum of at most two non-overlapping intervals in a list of Intervals
K-th Largest Sum Contiguous Subarray

Hard Interview Questions on Heap Data Structure
Merge k sorted arrays
Merge k Sorted Lists
Find the median of a stream of running integers
Smallest range in K lists
Huffman Encoding
Minimum cost to connect all cities
Single-Source Shortest Paths – Dijkstra’s Algorithm
Sliding Window Maximum (Maximum of all subarrays of size K)
K maximum sum combinations from two arrays
Merge two sorted arrays in O(1) extra space using Heap

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