All Hard Articles

Check if it is possible to get given sum by taking one element from each row

Given a 2-D array of N rows and M columns and an integer K. The task is to find whether is it possible to take… Read More

DSA

Dynamic Programming

Matrix

Understanding of LSTM Networks

This article talks about the problems of conventional RNNs, namely, the vanishing and exploding gradients, and provides a convenient solution to these problems in the… Read More

Deep-Learning

Neural Network

Machine Learning

Modify array by merging elements with addition such that it consists of only Primes.

Given an array arr[] consisting of positive integers, the task is to check whether we can modify the array by adding any of the elements… Read More

Prime Number

Arrays

Bit Magic

DSA

Dynamic Programming

Mathematical

Recursion

Minimum number of squares whose sum equals to given number N | set 2

A number can always be represented as a sum of squares of other numbers. Note that 1 is a square, and we can always break… Read More

DSA

Dynamic Programming

Mathematical

How to Integrate Webcam using JavaScript on HTML5 ?

In this article, we will share a very simple JavaScript code snippet through which you can easily integrate your webcam into an HTML5 web page.… Read More

JavaScript-Questions

JavaScript

Web Technologies

String Interpolation in JavaScript

String interpolation is a great programming language feature that allows injecting variables, function calls, and arithmetic expressions directly into a string. String interpolation was absent… Read More

JavaScript-Misc

Picked

JavaScript

Web Technologies

Leftmost Column with atleast one 1 in a row-wise sorted binary matrix | Set 2

Given a binary matrix mat[][] containing 0’s and 1’s. Each row of the matrix is sorted in the non-decreasing order, the task is to find… Read More

Algorithms

Data Structures

DSA

Matrix

Searching

Find the value mapped to a given composite key for every query

Given three arrays firstkey[], secondkey[] and value[] where elements firstkey[i] and secondkey[i] denotes a composite key and their value is value[i], the task is to… Read More

Arrays

Competitive Programming

DSA

Hash

Count Possible Decodings of a given Digit Sequence in O(N) time and Constant Auxiliary space

Given a digit sequence S, the task is to find the number of possible decodings of the given digit sequence where 1 represents ‘A’, 2… Read More

DSA

Dynamic Programming

Find extra node in the second Linked list

Given two Linked list L1 and L2. The second list L2 contains all the nodes of L1 along with 1 extra node. The task is… Read More

Data Structures

DSA

Linked List

move_by_offset – Action Chains in Selenium Python

Selenium’s Python Module is built to perform automated testing with Python. ActionChains are a way to automate low-level interactions such as mouse movements, mouse button… Read More

Python-selenium

selenium

Python

Queries for greatest pair sum in the given index range using Segment Tree

Given an array arr[] containing N integers and an array Q[] representing the range [L, R], the task is to find the greatest pair sum… Read More

array-range-queries

Segment-Tree

Arrays

DSA

Recursion

Write From Home

Shortest subarray to be removed to make all Array elements unique

Given an array arr[] containing N elements, the task is to remove a subarray of minimum possible length from the given array such that all… Read More

frequency-counting

sliding-window

subarray

Algorithms

Arrays

C++ Programs

Divide and Conquer

DSA

Hash

Mathematical

Delete continuous nodes with sum K from a given linked list

Given a singly linked list and an integer K, the task is to remove all the continuous set of nodes whose sum is K from… Read More

DSA

Linked List

Mathematical

Write From Home

Find all ranges of consecutive numbers from Array

Given a sorted array arr[] consisting of N integers without any duplicates, the task is to find the ranges of consecutive numbers from that array.Examples:… Read More

Numbers

Arrays

DSA

School Programming

Difference between NP hard and NP complete problem

Prerequisite: NP-Completeness NP Problem: The NP problems set of problems whose solutions are hard to find but easy to verify and are solved by Non-Deterministic Machine in… Read More

Algorithms-NP Complete

NPHard

Algorithms

Analysis of Algorithms

Computer Subject

Difference Between

DSA

Design a data structure that supports insert, delete, getRandom in O(1) with duplicates

Design a Data Structure that can support the following operations in O(1) Time Complexity. insert(x): Inserts x in the data structure. Returns True if x… Read More

Advanced Data Structure

Analysis of Algorithms

DSA

Expected Number of Trials to get N Consecutive Heads

Given a number N. The task is to find the expected number of times a coin must be flipped to get N heads consecutively.Example: Input:… Read More

Analysis of Algorithms

C++

C/C++ Puzzles

Competitive Programming

DSA

Engineering Mathematics

Geometric

Mathematical

Puzzles

Minimum number of operations required to make two strings equal

Given Two Strings s1 and s2 containing only lowercase letters of same length. The task is to make these strings equal by using the minimum… Read More

disjoint-set

Algorithms

DSA

Strings

Write From Home

Find weight of MST in a complete graph with edge-weights either 0 or 1

Given an undirected weighted complete graph of N vertices. There are exactly M edges having weight 1 and rest all the possible edges have weight… Read More

Graph Minimum Spanning Tree

Algorithms

DSA

Graph

Greedy

Recursion

Sorting