Array Interview Questions

I am presenting a collection of commonly asked array interview questions. Array questions are the most asked questions these days. The interviewer wants to know, how efficient code you can write. Therefore practice technical questions on arrays.

These array practice questions will help you clear the difficult programming rounds. In other words, these rounds are based on array questions. But, you should practice it frequently. For example, you can practice 2 questions daily.

Below are the collections of array questions which will help you to practice questions on arrays. Practicing daily will help you to improve your programming logic to solve any new questions you will face.

Array interview questions will help you to clear at-least the first round of the technical interviews.

When you are working on array practice questions then keep one thing in mind to first solve the array questions without seeing the solution. After that, you can match how we have solved the question.

Topic
Sliding Window Maximum LeetCode Solution
Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution
Minimum swaps to make sequences increasing
Sum of nearest smaller and greater number
Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i
Contiguous Array
Maximum Length of Repeated Subarray
Count pair with Given Sum
Maximum difference between frequency of two elements such that element having greater frequency is also greater
All Unique Triplets that Sum up to a Given Value
Longest Subarray Having Count of 1s One More than Count of 0s
Maximum Array from Two given Arrays Keeping Order Same
Count Subarrays with Same Even and Odd Elements
Rearrange an Array Such that arr[i] is equal to i
Segregate 0s and 1s in an Array
Maximum Number of Chocolates to be Distributed Equally Among k Students
Maximum Consecutive Numbers Present in an Array
Move all negative elements to one side of array
Queries for Number of Distinct Elements in a Subarray
Queries on Probability of Even or Odd Number in given Ranges
Total Numbers With no Repeated Digits in a Range
Range Minimum Query (Square Root Decomposition and Sparse Table)
Range Sum Query using Sparse Table
Count and Toggle Queries on a Binary Array
Queries for Decimal Values of Subarrays of a Binary Array
Maximize Elements Using Another Array
Find whether an array is subset of another array
Print all triplets in sorted array that form AP
Find number of pairs in an array such that their XOR is 0
Given an Array of Pairs Find all Symmetric Pairs in it
Find all triplets with zero sum
Generate all possible sorted arrays from alternate elements of two given sorted arrays
Array Queries for multiply replacements and product
Check in binary array the number represented by a subarray is odd or even
Queries for counts of array elements with values in given range
Products of ranges in an array
Palindrome Permutation
Sort an array according to the order defined by another array
Shuffle 2n integers as a1-b1-a2-b2-a3-b3-..bn without using extra space
Distinct adjacent elements in an array
Construction of Longest Increasing Subsequence (N log N)
Maximize sum of consecutive differences in a circular array
Three way partitioning of an array around a given range
Check if X can give change to every person in the Queue
Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’
Maximum length subsequence with difference between adjacent elements as either 0 or 1
Replace two consecutive equal values with one greater
Find a sorted subsequence of size 3 in linear time
Maximum Product Subarray
Convert array into Zig-Zag fashion
Rearrange array such that even index elements are smaller and odd index elements are greater
Segregate even and odd numbers
Find Minimum In Rotated Sorted Array
Move all negative elements to end in order with extra space allowed
Rearrange array such that even positioned are greater than odd
Double the first element and move zero to end
Remove duplicates from sorted array
Product of array except self
First missing positive
Find the minimum distance between two numbers
Count pairs from two sorted arrays whose sum is equal to a given value x
Find the subarray with least average
Find the smallest positive integer value that cannot be represented as sum of any subset of a given array
Find minimum number of merge operations to make an array palindrome
Minimize the maximum difference between the heights
Find maximum average subarray of k length
Find minimum difference between any two elements
Count minimum steps to get the given desired array
Dividing Array into Pairs With Sum Divisible by K
Count Distinct Elements in Every Window of Size K
Count Subsets Having Distinct Even Numbers
Find Three Element From Different Three Arrays Such That a + b + c = sum
Longest Increasing Subsequence
Count Pairs Whose Products Exist in Array
Merge Overlapping Intervals
Median of Two Sorted Arrays
Maximum Product Subarray
Find Maximum of Minimum for Every Window Size in a Given Array
Longest Common Prefix Using Word by Word Matching
Minimum Size Subarray Sum
Intersection of Two Arrays
Search an Element in Sorted Rotated Array
Maximum Product Subarray
3 Sum
Find The Duplicate Number
Maximum Sum of 3 Non-Overlapping Subarrays
Minimum Index Sum of Two Lists
Split Array Into Consecutive Subsequences
Find the Duplicate Element
Find the Only Repetitive Element Between 1 to N-1
Finding K closest element
Jump Game
Combination Sum
Search in Sorted Rotated Array
Maximum Subarray
Sliding Window Maximum
Delete And Earn
Length of Longest Fibonacci Subsequence
Merging Intervals
First Bad Version
Peak Index in a Mountain Array
4Sum
Create Maximum Number
Degree of an array
Queue Reconstruction by Height
Search Insert Position
Find Peak Element
Valid Triangle Number
Power of Two
Maximum size subarray sum equals k
Next greater element
Guess The Word
Missing Number
Merge Sorted Array
Partition Equal Subset Sum
Last Stone Weight
Sort Colors
Rotate Array
Subarray Sum Equals k
Infix to Postfix
Circular Queue
Given a sorted array and a number x, find the pair in array whose sum is closest to x
Find the subarray whose sum is equal to a given number X
Arrange Even and Odd number such that Odd comes after Even
Minimum number of Merge Operations to make an Array Palindrome
Form Minimum Number from Given Sequence of D’s and I’s
Longest Span with same Sum in two Binary Arrays II
Find the Subarray of given length with Least Average
Find Zeros to be Flipped so that Number of Consecutive 1’s is Maximized
Merge K Sorted Arrays and Print Sorted Output
Find the Minimum Element in a Sorted and Rotated Array
Find the point where a monotonically increasing function becomes positive first time
Print all Possible Combinations of R Elements in a given Array of size N
Sort Elements by Frequency II
Stock Buy Sell to Maximize Profit
Merge Overlapping Intervals II
Maximum Subarray Sum using Divide and Conquer
Pancake Sorting Problem
Pancake Sorting
Arrange given Numbers to Form the Biggest Number II
Iterative Implementation of Quick Sort
Shuffle a given Array
Find the Row with Maximum Number of 1’s
Sorting a K Sorted Array
Maximum Product Subarray II
Largest Subarray with Equal Number of 0’s and 1’s
Find the two Numbers with Odd Occurrences in an Unsorted Array
Maximum Sum Increasing Subsequence
Implement Two Stacks in an Array
Number of Smaller Elements on Right Side
Increasing Subsequence of Length three with Maximum Product
Elements Appear more than N/K times in Array
Find the Peak Element from an Array
Rearrange Positive and Negative Numbers Alternatively in Array
Find the Maximum Repeating Number in Array
Tug of War
First Circular Tour to Visit all the Petrol Bunks
Count Possible Triangles
Maximum Circular Subarray Sum
Four Elements that Sum to Given
Maximum Length of Chain Pairs
Find Pair with Given Difference
Partition Problem
The Celebrity Problem
Find a Sorted Subsequence of size 3
Subarray with Given Sum
Maximum Element in an Array which is Increasing and then Decreasing
Count Minimum Steps to Get the given Array
Find the Lost Element From a Duplicated Array
Rearrange given Array in Maximum Minimum Form
Subarray and Subsequence
Merge Two Sorted Arrays
Count of Triplets With Sum Less than Given Value
Reorder Array Using Given Indexes
Next Greater Element in an Array
Merging Two Sorted Arrays
Reorder an Array According to the Given Indexes
Find a Fixed Point in a Given Array
Find Element Using Binary Search in Sorted Array
Find Triplet in Array With a Given Sum
Check if the Elements of an Array are Consecutive
Find Duplicates in an Array in Most Efficient Way
Sort 0s 1s and 2s in an Array
Find Leaders in an Array
Smallest Positive Number Missing in an Unsorted Array
Find K Length Subarray of Maximum Average
Find Pythagorean Triplets from Array
Move All the Zeros to the End of the Given Array
Find Minimum Distance Between Two Numbers in an Array
Rotate Image by 90 degrees
Count Number of Occurrences in a Sorted Array
Maximum Sum of Non Consecutive Elements
Find Smallest Missing Number in a Sorted Array
First Repeating Element
Multiplication of Previous and Next
A Product Array Puzzle
Find All Pairs With a Given Difference
Find all Common Elements in Given Three Sorted Arrays
Find the first Repeating Number in a Given Array
Print All Distinct Elements of the Array
Maximum difference between two elements such as larger element comes after smaller
Majority Element
Find the First and Second Smallest Elements
Find the Number Occurring Odd Number of Times in an Array
Sort Elements by Frequency of Occurrences
Find the Missing Number
Find Nearest Greater and Smaller Element
Largest Sum Contiguous Subarray
Reverse an Array
Find a Triplet That Sum to a Given Value
Find elements pair from array whose sum equal to number
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