Arrays Data Structure
In this complete guide to Array Data Structures, you will learn about the basics of Arrays, how to get started with Array, learning, strategy, resources, problems, and much more.
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88
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60
Problems
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Getting Started with Arrays
Array Operations
Different ways of accessing array elements in C++
Why does accessing an Array element take O(1) time?
Inserting Elements in an Array - Array Operations
Searching Elements in an Array | Array Operations
Deleting Elements in an Array - Array Operations
Search, Insert, and Delete in an Unsorted Array | Array Operations
Search, Insert, and Delete in an Sorted Array | Array Operations
Array Searching
Problems on Array Searching
Array Sorting
Problems on Array Sorting
Multi-dimensional Arrays
Prefix Sum Array
Prefix Sum Array - Implementation and Applications in Competitive Programming
Equilibrium Index
Subarray with 0 sum
Maximum subarray size having all subarrays sums less than k
Longest Subarray With Sum Divisible By K
Find an element in array such that sum of left array is equal to sum of right array
Prefix Sum of Matrix
Two Pointers Technique on Array
Two Pointers Technique
Find the closest pair from two sorted arrays
2 Sum - Pair Sum Closest to Target using Binary Search
3 Sum - Find All Triplets with Zero Sum
3 Sum - Triplet Sum in Array
Find a triplet such that sum of two equals to third element
4 Sum - Check if a Quadruple with given Sum Exists in an Array
Easy Problems on Array
Array Reverse - Complete Tutorial
Program to find the minimum (or maximum) element of an array
Move all negative numbers to beginning and positive to end with constant extra space
Peak Element in Array
Sort an array of 0s, 1s and 2s - Dutch National Flag Problem
Count number of occurrences (or frequency) in a sorted array
Union and Intersection of Two Sorted Arrays - Complete Tutorial
Subarray with Given Sum
K’th Smallest Element in Unsorted Array
Medium Problems on Array
Find duplicates in O(n) time and O(n) extra space
Rotate Array By One
Find the first repeating element in an array of integers
Find the Missing Number
2 Sum - Count pairs with given sum
Find common elements in three sorted arrays
Find first non-repeating element in a given Array of integers
Count subarrays with equal number of 1's and 0's
Rearrange Array Elements by Sign
Subarray with 0 sum
Maximum Subarray Sum - Kadane's Algorithm
Find the Factorial of a large number
Minimum in a Sorted and Rotated Array
Maximum sum of i*arr[i] among all rotations of a given array
Hard Problems on Array
Missing and Repeating in an Array
Maximum Sum Path in Two Arrays
Given an array arr[], find the maximum j - i such that arr[i] <= arr[j]
2 Sum - Pair Sum Closest to Target using Binary Search
Find the smallest positive integer value that cannot be represented as sum of any subset of a given array
Chocolate Distribution Problem
About the Complete Guide to Arrays
The dream of every programmer is to become not just a good, but also a great programmer. We all want to achieve our goals and to achieve our goals, we must have a great plan with us. In this context, we have decided to provide a complete guide for Arrays interview preparation, which will help you to tackle the problems that are mostly asked in the interview, such as What is an Array, What is Array in C language, How do you initialize an Array in C, How to sort an Array, etc. We have also covered the topics such as Top Theoretical interview questions and Top interview coding questions in this complete guide for Array interview preparation.
Basic terminologies of array
While learning about Array Data Structures in this Complete Guide on Arrays, you will come across some common terms that will be used multiple times. Some of these terms are:
- Array Index: In an array, elements are identified by their indexes. Array index starts from 0.
- Array element: Elements are items stored in an array and can be accessed by their index
- Array Length: The length of an array is determined by the number of elements it can contain.
Why Array Data Structures is needed?
Assume there is a class of five students and if we have to keep records of their marks in examination then, we can do this by declaring five variables individual and keeping track of records but what if the number of students becomes very large, it would be challenging to manipulate and maintain the data.
What it means is that, we can use normal variables (v1, v2, v3, ..) when we have a small number of objects. But if we want to store a large number of instances, it becomes difficult to manage them with normal variables. The idea of an array is to represent many instances in one variable.
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