All Hard Articles

SQL Full Form

SQL is a declarative language laying its basics on relation algebra. It is a standardized language supported by all major commercial databases. The query optimizer… Read More

Picked

DBMS

Full Form

GATE CS

Minimum cost to colour a Tree with no 3 adjacent vertices having same colour

Given a tree with N nodes value from 0 to (N – 1) and a 2D array arr[][] of size dimensions 3xN, where arr[i][j] denotes… Read More

optimization-technique

tree-traversal

DSA

Tree

Count of elements to be inserted to make Array sum twice the XOR of Array

Given an array arr[] of size N, the task is to find the minimum number of elements that need to be inserted into the array… Read More

Bitwise-XOR

Arrays

DSA

Mathematical

Misc

How to add whatsapp share button on a website ?

WhatsApp is the most popular messaging app. This article describes how you can add WhatsApp share button in your website. Note: This will work only… Read More

CSS-Misc

HTML-Misc

CSS

HTML

JavaScript

Web Technologies

Node util.promisify() Method

`util.promisify()` in Node.js converts callback-based methods to promise-based, aiding in managing asynchronous code more cleanly. This alleviates callback nesting issues, enhancing code readability, and simplifying… Read More

C++-Virtual Functions

Java-NavigableMap

Node.js-util-module

TCS-coding-questions

Node.js

Web Technologies

Console readPassword() method in Java with Examples

The readPassword() method of Console class in Java is of two types: 1. The readPassword() method of Console class in Java is used to read… Read More

Java-Functions

Java-IO package

Java

Angular 8 | Introduction

Angular 8 is a client-side TypeScript based, front-end web framework by Google. Angular 8 is a great, reusable UI (User Interface) library for the developers… Read More

AngularJS-Basics

Picked

AngularJS

Web Technologies

Creating NotePad using PyQt5 – Python

In this article we will see how we can create notepad using PyQt5.Notepad is a generic text editor that allows you to create, open, edit,… Read More

PyQt-exercise

Python-gui

Python-PyQt

Python

Creating a simple browser using PyQt5

In this article we will see how we can create a simple browser using PyQt5. Web browser is a software application for accessing information on… Read More

PyQt-exercise

Python-gui

Python-PyQt

Python

Minimum count of numbers required from given array to represent S

Given an integer S and an array arr[], the task is to find the minimum number of elements whose sum is S, such that any… Read More

Algorithms

Arrays

Backtracking

C++ Programs

DSA

Dynamic Programming

Mathematical

Recursion

Minimize the cost to make all the adjacent elements distinct in an Array

Given two integer arrays arr[] and cost[] of size N, the task is to make all adjacent elements distinct at minimum cost. cost[i] denotes the… Read More

Arrays

DSA

Dynamic Programming

Greedy

Replace every node of a Linked list with the next greater element on right side

Given a linked list, the task is to find the Next Greater Element for every node of the linked list. Note: For nodes with no next… Read More

Traversal

DSA

Linked List

Check if the given permutation is a valid BFS of a given Tree

Given a tree with N nodes numbered from 1 to N and a permutation array of numbers from 1 to N. Check if it is… Read More

BFS

cpp-map

permutation

tree-traversal

Algorithms

Arrays

DSA

Queue

Tree

Difference between 2G and 3G Cellular Network

1. Second Generation (2G) : 2G mobile network is based on GSM(Global System for Mobile Communication). This technology was developed in Finland in 1991. Messages… Read More

Computer Networks-Network Layer

Computer Networks

Computer Subject

Difference Between

Difference between Tree Topology and Bus Topology

1. Tree Topology: Tree topology is a type of network topology in which the nodes are arranged in the design of a tree. In tree… Read More

Computer Networks

Difference Between

Length of maximum product subarray

Given an integer array arr[] of size N, the task is to find the maximum length subarray whose products of element is non zero. . Examples:… Read More

subarray

Arrays

DSA

Mathematical

Construct a Turing Machine for language L = {a^n b^m c^nm where n >=0 and m >= 0}

Prerequisite – Turing Machine The language L = {anbmcnm | n >= 0 and m>=0} represents a kind of language where we use only 3… Read More

Computer Subject

Theory of Computation

RDBMS Architecture

RDBMS stands for Relational Database Management System and it implements SQL. In the real-world scenario, people use the Relational Database Management System to collect information… Read More

DBMS-Relational Model

DBMS-SQL

DBMS

Check if sum of exactly K elements of the Array can be odd or not

Given an array, arr[] and an integer K. Check whether it is possible to get an odd sum by choosing exactly K elements of the… Read More

Arrays

DSA

Mathematical

Advantages and Disadvantages of Cloud Security

Cloud Computing security or, more essentially, cloud security is an advancing sub-domain of computer security, arrange security, and, more broadly, data security. It alludes to… Read More

Cloud-Computing

GBlog