Top 50 Array Coding Problems for Programming Interviews

An array is a linear data structure that stores the data on contiguous memory locations. In this article, we will discuss the most common and popular problems of arrays in Data Structures and Algorithms. We are covering basic to advanced-level problems which will help you to learn the whole concept in a structured manner.

Here is the list of problems that have been asked in programming interviews ?

Easy Array Problems

Following are the easy array problems ?

• Array Peak Element
• Find Minimum in Sorted Array
• Search in Rotated Array
• Sort Array by Frequency
• Overlapping Intervals
• Merge Two Sorted Arrays
• Find Common Elements in Arrays
• Find Equilibrium Point
• Binary Array Sorting
• Search Element in Matrix
• Sum of Even Numbers After Queries
• Count Pairs with Given Sum
• Triplet Sum in Array
• First and Last Position in Sorted Array
• Array Subset of Another Array
• Find Missing Number
• Longest Common Prefix
• Find Single Element
• Find Union of Two Arrays
• Count Elements with Greater or Equal Elements

Intermediate Array Problems

Intermediate array problems are given below ?

• 3Sum Closest
• 4Sum Problem
• Minimum Size Subarray Sum
• Find All Duplicates
• Circular Array Loop
• Find Peak Element II
• Container With Most Water
• Merge Intervals
• Sort Colors (Dutch National Flag)
• Jump Game II
• Minimum Platform Problem
• Longest Increasing Subsequence
• Subarray Sum Equals K
• Find All Numbers Disappeared
• Array Nesting
• Game of Life
• Beautiful Arrangement
• Complex Number Multiplication
• Minimum Increment to Make Array Unique
• Asteroid Collision

Hard Array Problems

Hard array problems are the following ?

• First Missing Positive
• Maximum Gap
• Array of Doubled Pairs
• Longest Consecutive Sequence
• Maximum Sum Rectangular Submatrix
• Best Time to Buy and Sell Stock
• Maximum Product of Three Numbers
• Median of Two Sorted Arrays
• Count of Smaller Numbers After Self
• Maximum Sum of 3 Non-Overlapping Subarrays