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Last updated: Oct 28, 2021

HashMap

A HashMap is a data structure that can map specific keys to certain values. The keys and values could be anything. Hashmaps can retrieve data faster than arrays and linked lists. A hashmap can check the presence of a particular key in O(1) time.

Index mapping is the most widely used hashing technique. This blog will discuss the concept of index mapping as well as its implementation.

Author Vivek Kumar Mehta

1 upvote

Double Hashing MEDIUM

The following blog discusses double hashing along with its advantages and limitations of its implementation in C++.

Author Ishita Chawla

0 upvotes

Rehashing in Data Structure MEDIUM

Hashing is one of the favorite topics of interviewers when it comes to coding interviews, and in this blog, we will see the most frequently asked topic from hashing, i.e., load factor and rehashing.

0 upvotes

Java Hashmap getordefault() Method EASY

In this article, we will discuss its syntax, parameters, and return value, with examples.

Author Ravi Khorwal

0 upvotes

Hashing in Data Structure

In this blog, we will discuss the fundamentals of hashing and how it helps make our operations fast.

Author Husen Kagdi

0 upvotes

Cuckoo Hashing MEDIUM

In this blog, we will learn about Cuckoo Hashing which helps to achieve constant time worst-case complexity for lookups.

Author Lucifer go

1 upvote

Difference between HashMap and HashTable EASY

In this article, we will discuss Difference Between HashMap and HashTable both data structures in Java for key-value pairs.

Author Aman kumar Chourasiya

0 upvotes

Internal Working of HashMap in Java EASY

HashMap in Java is a data structure that stores key-value pairs. It provides quick access to values based on their keys.

Author Shreya Deep

2 upvotes

Difference between HashMap and TreeMap

This article covers the difference between hashmap and treemap. The major difference between hashmap and treemap is hashmap implements the map interface, whereas treemap implements the sortedmap interface.

0 upvotes

Difference Between HashSet and TreeSet MEDIUM

A HashSet in Java implements the Set interface and is supported by a HashMap, whereas a TreeSet implements sorted sets and is backed by a TreeMap.

Author Sanjana kumari

0 upvotes

Difference between HashMap and LinkedHashMap in Java EASY

HashMap is a data structure that stores items using "key-value" pairs. LinkedHashMap inherits the functionality of the HashMap class since it is a subclass.

0 upvotes

Separate Chaining and Open Addressing for Collision Handling

Learn about the various Collision Handling mechanisms used in hashing techniques with interesting explanations and fun examples.

Author Pranav Gautam

0 upvotes

Binary Subarrays with Sum MEDIUM

In this blog, we will discuss a Leetcode Medium problem namely, Binary subarrays with sum along with its implementation in C++ language.

Author Husen Kagdi

0 upvotes

LRU Cache Implementation

In this article, we’ll be seeing the implementation of the LRU cache in Java along with its working.

Author vaishnavi pandey

0 upvotes

Asteroid Collision MEDIUM

In this blog, we will discuss an interview question called Asteroid Collision with its approach and algorithm in detail.

Author Rasha Abdul Khader

2 upvotes

Reduce Array Size to The Half MEDIUM

The blog discusses in detail the Reduce Array Size to the Half Problem. We’ll discuss some approaches to solve the problem and the time and space complexity for each method.

Author Deleted User

0 upvotes

Check if there is a subarray with 0 sum EASY

This article will help you solve the famous interview question ‘Check if there is a subarray with 0 sum’

0 upvotes

Check for palindrome after every character replacement query EASY

This article will help you solve the famous interview question, "Check for palindrome after every character replacement query".

0 upvotes

Sum of all Unique Sub-array Sum for a Given Array MEDIUM

In this blog, we will discuss the problem of finding sum of all unique sub-array sum for a given array.

Author Naman Kukreja

0 upvotes

Count of Subarrays with Equal Number of 1’s and 0’s MEDIUM

In this blog, we will learn a programming question based on hashing and subarray along with its time and space complexity.

Author Juhi Sinha

0 upvotes

Elements to be added such that all elements of a range are present in an array EASY

In this article, we will discuss the solution for the given problem which is Elements to be added so that all the elements of a range are present.

Author Ankit Kumar

1 upvote

Longest Subarray Having Count of 1’s One More Than Count of 0’s MEDIUM

In this blog, we will learn a programming question based on hashing and subarray, along with its time and space complexity.

Author Juhi Sinha

0 upvotes

Subarrays with same Even and Odd elements

In this blog, we are going to discuss a coding problem in which we have to print the count of even-odd subarrays in an array.

0 upvotes

Count all Subarrays having Sum Divisible by K

In this blog, we will be discussing a coding problem in which we have to print the total count of all the sub-arrays that have a sum divisible by K.

0 upvotes

Minimum Operations to Choose Array Elements with Sum as K by Choosing an Element from the Front, or Rear or Both MEDIUM

This article will brief you on the problem to calculate Minimum operations to choose Array elements with sum as K by choosing an element from the front, or rear or both

Author Urwashi27

0 upvotes

Minimum Index Sum for the Common Elements of Two Lists MEDIUM

In this article, we will discuss the Minimum Index Sum for Common Elements of Two Lists problem, including the algorithm and the implementation using hashmap in different languages.

Author Kanak Rana

0 upvotes

The Maximum possible difference of the sum of two subsets of an array MEDIUM

In this blog, we have discussed a question based on subsets of arrays that includes an essential concept from the topic, which we will explore through the explanation and the solutions and algorithms.

Author Dhruv Sharma

0 upvotes

Difference Between Concurrent Hashmap Vs Synchronized Hashmap MEDIUM

This article incorporates information about the difference between concurrent hashmap and synchronized hashmap.

Author dhananjay kumar

0 upvotes

Maximum Difference Between the First and Last Indexes of an Element in an Array MEDIUM

In this blog, we will learn a programming question based on hashing, along with its time and space complexity.

Author Juhi Sinha

0 upvotes

Maximum distance between two occurrences of same element in array EASY

In this article, we will see the solution Maximum distance between two occurrences of same element in array.

Author Alok Pandey

0 upvotes

Maximum Consecutive Numbers present in an Array EASY

In this blog, we will discuss the approach using which we can find the count of maximum consecutive numbers present in an array.

Author Abhishek Nayak

0 upvotes

Find number of pairs in an array such that their XOR is 0 EASY

In this article, we will find number of pairs in an array such that their XOR is 0.

Author Manan Singhal

0 upvotes

Find the Highest Frequency of Non-Negative Powers that are the Same as Indices of Elements in the given Array MEDIUM

In this article, we will learn how to find the frequency of the power which occurs highest times if we write the number present at an index of an array as some power of that index.

Author Shreya Deep

0 upvotes

Check if array contains contiguous integers with duplicates allowed

In this article, we will check if array contains contiguous integers with duplicates allowed.

Author Manan Singhal

0 upvotes

Sum of f(a[i], a[j]) over all pairs in an array of n integers

In this article, we will find the sum of f(a[i], a[j]) over all pairs in an array of n integers.

Author Manan Singhal

0 upvotes

Second most repeated word in a sequence MEDIUM

We will discuss the problem statement to find the second most repeated word in a sequence using the hashing method, including the algorithm, code, and complexities in this blog.

Author devika varshney

0 upvotes

Distribute items such that a person cannot take more than two items of the same type

This article gives you an in-depth solution to the question Distribute items such that a person cannot take more than two items of the same type.

Author Indrajit Kumar

0 upvotes

Distribute the Maximum Number of Chocolates Amongst X Students HARD

In this blog, we will learn how to solve the problem to distribute the maximum number of chocolates amongst X students via Hashing method.

Author Lucifer go

0 upvotes

Difference between highest and least frequencies in an array MEDIUM

In this blog, we have discussed a question based on tracking the counts of the frequencies of the different elements in an array that includes an essential concept from the topic, which we will explore through the explanation and the solutions and algorithms.

Author Dhruv Sharma

0 upvotes

Count subsets having distinct even numbers

We will discuss how to solve a question related to subset and array.

Author Indrajit Kumar

0 upvotes

The K Weakest Rows in a Matrix

The following article discusses the problem 'The K Weakest Rows in a Matrix' along with its solution and its implementation.

Author brainstorming

0 upvotes

Length of the largest subarray with 0 sum

We will discuss how to solve a question related to the subarray sum.

Author Indrajit Kumar

0 upvotes

Find All Pairs (a, b) In An Array Such That a % b = k MEDIUM

In this blog, we will discuss the problem statement to find all pairs (a, b) in an array such that a % b = k using hashing method, including the algorithm, code, and its complexities.

Author devika varshney

0 upvotes

Convert an array to reduced form(using hashtable) EASY

This article incorporates the implementation of converting an array into a reduced form using the hashtable.

Author dhananjay kumar

0 upvotes

Longest Subarray not having more than K Distinct Elements MEDIUM

This article will discuss the problem of finding the longest subarray not having more than K Distinct Elements. We will also discuss the implementation and complexities of the solution to the problem.

Author Teesha Goyal

0 upvotes

Find four elements that sum to a given value MEDIUM

This article will help you solve the famous interview question, "Find four elements that sum to a given value".

0 upvotes

Find all permuted rows of a given row in a matrix EASY

This article incorporates the implementation of finding all permuted rows of a given row in a matrix with the help of a hashset.

Author dhananjay kumar

0 upvotes

Most frequent element in an array EASY

This article discusses a program to find the element that occurs the most frequently in the n-element size array Arry[].

Author Anuradha_8356

0 upvotes

Kth Distinct String in an Array EASY

In this blog, we will discuss one of the beginner-level problems asked on the topic of Hashmap, i.e., Kth Distinct String in an Array

Author Saksham Gupta

1 upvote

Check if an Array can be Divided into Pairs Whose Sum is Divisible by K MEDIUM

In this blog, we discuss how to check if an array can be divided into pairs whose sum is divisible by k, its algorithm, and implementation using a hashmap.

Author Ayushi Goyal

0 upvotes

Check if a given array contains duplicate elements within k distance from each other EASY

In this article, we will see the solution to an array problem that Check if a given array contains duplicate elements within k distance from each other.

Author Alok Pandey

0 upvotes

Find Three Element from Different Three Arrays such that A + B + C = Sum MEDIUM

In this blog, we discuss how to find three elements from different three arrays such that a + b + c = sum, its algorithm and implementation using a hashmap.

Author Ayushi Goyal

0 upvotes

Find Pairs of Positive and Negative Values Present in a Given Array MEDIUM

In this article, we will solve a very common problem to find pairs of positive and negative values present in a given array.

Author Aditya kumar

0 upvotes

Find pair with greatest product in array MEDIUM

This article incorporates the implementation of the problem Find Pair with greatest product in array using hashing.

0 upvotes

First element occurring k times in an array EASY

This article incorporates the implementation of finding the first element that occurs k times in an array with the help of a hashmap

Author dhananjay kumar

0 upvotes

Non-overlapping sum of two sets EASY

We will discuss how to solve a question related to the hashing, called the non-overlapping sum of two sets.

0 upvotes

Numbers with prime frequencies greater than or equal to k EASY

In this article we will see how to solve ”Numbers with Prime frequencies greater than or equal to k.” with the help of its example, algorithm, explanation, code implementation and complexity analysis.

Author Gaurav Bashisht

1 upvote

Minimum Number of Distinct Elements after Removing M items MEDIUM

In this blog, we will discuss the hashmap approach using which we can print the minimum number of distinct elements after removing m items.

Author Abhishek Nayak

0 upvotes

Check If Two Given Sets Are Disjoint EASY

We will discuss one of the basic questions related to the DSU, which is How to check if two given sets are disjoint.

0 upvotes

Check if Two Arrays are Equal or Not EASY

This blog will cover the problem statement to check if two arrays are equal or not. We will be discussing the algorithm, implementation and time and space complexity.

Author Sneha Mallik

0 upvotes

Count maximum points on same line HARD

In this article, we will see the solution to an array problem Count maximum points on same line.

Author Alok Pandey

0 upvotes

Count pairs with given sum EASY

This article incorporates how to count pairs with a given sum.

Author Amit Singh

2 upvotes

Count quadruples from four sorted arrays whose sum is equal to a given value x EASY

This article is about the “Count Quadruples from four stored arrays whose sum is equal to a given value x” problem, which can be solved using hashing technique. In this blog we will learn about how to solve this problem with their examples and algorithms. We will also see the implementation of the algorithm

Author Gaurav Bashisht

1 upvote

Count pairs whose products exist in array EASY

This article incorporates how to count pairs whose products exist in an array.

Author Amit Singh

0 upvotes

Count Items Common to Both the Lists But With Different Prices EASY

Meta Description: This article incorporates a detailed discussion on the problem Count items common to both the lists but with different prices along with implementation in different languages.

0 upvotes

Find All Duplicates in an Array

This article will brief you on the problem of finding all duplicates in an array

Author Urwashi27

1 upvote

Find Number of Employees Under Every Manager HARD

This blog is about “ find number of employees under every manager” problem, which can be solved using hashing techniques. In this article we will learn about how to solve this question with their examples and algorithms. We will also see the implementation of the algorithm.

Author Gaurav Bashisht

3 upvotes

Find duplicates in a given array when elements are not limited to a range MEDIUM

This blog discusses unordered_map for hashing methods to find duplicates in a given array when elements are not limited to a range.

Author Anuradha_8356

0 upvotes

Find Missing Elements of a Range EASY

In this blog, we will discuss the different methods to solve the problem of finding missing elements of a range, using both the native approach of sorting an array and the optimal approach of Hashing.

Author Kanak Rana

0 upvotes

Find The Top Three Repeated Elements In An Array MEDIUM

In this blog, we will discuss the top three elements in an array problem including the algorithm and the implementation using hashmap in different languages.

Author Kanak Rana

0 upvotes

Find top k numbers in a stream

This article incorporates how to find top k numbers in a stream.

Author Amit Singh

0 upvotes

Find elements which are present in one array but not in other MEDIUM

In this blog, we will discuss the different approaches to find the elements which are present in one array but not in another array.

Author Anuradha_8356

0 upvotes

Longest Consecutive Sequence MEDIUM

A "Longest Consecutive Sequence" refers to a consecutive sequence of numbers within a given set where each number follows the previous one without any gaps.

Author Kushleen Waraich

2 upvotes

Group words with same set of characters MEDIUM

We will go through the problem statement to group words with same set of characters using hashing method, including the algorithm, code, and its complexities in this blog.

Author devika varshney

0 upvotes

Print All Distinct Elements Of A Given Integer Array EASY

In this article, we will solve a very famous problem, i.e., Print All Distinct Elements Of A Given Integer Array.

Author Aditya kumar

0 upvotes

Remove the Minimum Number of Elements Such that No Common Element Exist in both Array EASY

In this article, we will look into an important coding question, Remove the Minimum Number of Elements Such that No Common Element Exist in both Array.

Author Komal Shaw

0 upvotes

Change the Array into a Permutation of Numbers from 1 to n MEDIUM

In this article, we will look into an important coding question, Change the Array into a Permutation of Numbers from 1 to n.

Author Komal Shaw

0 upvotes

Custom Sort String

In this blog, we will discuss one of the famous and important questions from the interview perspective, i.e., Custom Sort String.

Author Saksham Gupta

0 upvotes

Fair Candy Swap

In this blog, we will discuss the problem of swapping candies and see the various implementations of this problem.

Author Deleted User

0 upvotes