All Medium Articles

Construct a Matrix N x N with first N^2 natural numbers for an input N

Given an integer N, the task is to construct a matrix M[][] of size N x N with numbers in the range [1, N^2] with… Read More

chessboard-problems

submatrix

DSA

Greedy

Mathematical

Matrix

School Programming

Largest possible Subset from an Array such that no element is K times any other element in the Subset

Given an array arr[] consisting of N distinct integers and an integer K, the task is to find the maximum size of a subset possible… Read More

frequency-counting

subset

DSA

Greedy

Hash

Searching

Sorting

Count of substrings consisting of even number of vowels

Given a string S of length N, the task is to find the number of non-empty substrings having even number of vowels. Examples: Input: N… Read More

substring

vowel-consonant

DSA

Mathematical

Searching

Strings

Smallest subarray with sum greater than or equal to K

Given an array A[] consisting of N integers and an integer K, the task is to find the length of the smallest subarray with sum… Read More

Binary Search

cpp-map

prefix-sum

sliding-window

subarray

Arrays

DSA

Hash

Mathematical

Searching

Generate a Number in Decreasing order of Frequencies of characters of a given String

Given a string Str of length N, consisting of lowercase alphabets, the task is to generate a number in decreasing order of the frequency of… Read More

ASCII

cpp-map

frequency-counting

C++

DSA

Hash

Sorting

Strings

Check if a String contains any index with more than K active characters

Given a string S, containing lowercase English alphabets, and an integer K, the task is to find any index of the string which consists of… Read More

cpp-map

cpp-set

frequency-counting

DSA

Hash

Strings

ShimmerLayout in Android with Examples

ShimmerLayout can be used to add a Shimmer Effect (like the one on Facebook or LinkedIn) to the Android Application. This layout is mainly used… Read More

Android

Java

Kotlin

Find all root to leaf path sum of a Binary Tree

Given a Binary Tree, the task is to print all the root to leaf path sum of the given Binary Tree. Examples: Input: 30 /… Read More

Binary Tree

DSA

Tree

Rabin-Karp algorithm for Pattern Searching in Matrix

Given matrices txt[][] of dimensions m1 x m2 and pattern pat[][] of dimensions n1 x n2, the task is to check whether a pattern exists… Read More

Hash

DSA

Greedy

Hash

Mathematical

Matrix

Pattern Searching

Python

Searching

Minimize operations required to obtain N

Given an integer N, the task is to obtain N, starting from 1 using minimum number of operations. The operations that can be performed in… Read More

divisibility

DSA

Dynamic Programming

Mathematical

Recursion

Sum of prime numbers in range [L, R] from given Array for Q queries

Given an array arr[] of the size of N followed by an array of Q queries, of the following two types: Query Type 1: Given… Read More

array-range-queries

Prime Number

Segment-Tree

sieve

Advanced Data Structure

Arrays

C++

C++ Programs

Competitive Programming

DSA

Dynamic Programming

Hash

Mathematical

Tree

How to change Input box borders after filling the box using JavaScript ?

In this article, we will change the input border after filling in the text on the input text field. The onchange event attribute works when… Read More

JavaScript-Questions

JavaScript

Web Technologies

How Node.js works behind the scene ?

Node.js is the JavaScript runtime environment which is based on Google’s V8 Engine i.e. with the help of Node.js we can run the JavaScript outside… Read More

Node.js-Misc

Node.js

Web Technologies

How to connect SQL Server database from JavaScript in the browser ?

There is no common way to connect to the SQL Server database from a JavaScript client, every browser has its own API and packages to… Read More

JavaScript-Questions

Picked

JavaScript

Node.js

Web Technologies

Unit Testing of Node.js Application

Node.js is a widely used javascript library based on Chrome’s V8 JavaScript engine for developing server-side applications in web development. Unit Testing is a software… Read More

Node.js-Misc

Picked

JavaScript

Node.js

Web Technologies

Puzzle | The Counters and Rectangular Board

Given 3N counters where N >= 1, there are three types of counters Red, White, and Blue all of them equal in count i.e., N… Read More

interview-preparation

Logical Puzzles

Puzzles

How does Volatile qualifier of C works in Computing System

Prerequisite: Computing systems, Processing unit Processing Unit: Processing units also have some small memory called registers. The interface between the processor (processing unit) and memory… Read More

C Language

Computer Organization & Architecture

Computer Subject

TechTips

PostgreSQL – Foreign Key

In this article, we will look into the PostgreSQL Foreign key constraints using SQL statements. A foreign key is a column or a group of… Read More

postgreSQL-managing-table

PostgreSQL

Minimize cost to color all the vertices of an Undirected Graph using given operation

Given two integers V and E representing the number of vertices and edges of an undirected graph G(V, E), a list of edges EdgeList, and… Read More

Algorithms-Graph Traversals

connected-components

DFS

DSA

Graph

Greedy

Recursion

Searching

High-Level Data Link Control (HDLC) Encapsulation

High-Level Data Link Control (HDLC) basically provides reliable delivery of data frames over a network or communication link. HDLC provides various operations such as framing,… Read More

Computer Networks