All Hard Articles

Count of numbers in range which are divisible by M and have digit D at odd places

Given two numbers M, D, and an array arr[] which represents the range [L, R], the task is to count the numbers in the range… Read More

DSA

Dynamic Programming

Mathematical

Split the given string into Primes : Digit DP

Given a string str that represents a large number, the task is to find the minimum number of segments the given string can be divided… Read More

Arrays

DSA

Dynamic Programming

Strings

Longest Palindrome in a String formed by concatenating its prefix and suffix

Given a string str consisting of lowercase English letters, the task is to find the longest palindromic string T which satisfies the following condition: T… Read More

cpp-strings

palindrome

substring

Analysis of Algorithms

DSA

Pattern Searching

Strings

Write From Home

Graphical Password Authentication

With increasing technical advancements the world is becoming digital at a high pace and everything is happening online. From paying your bills to ticket bookings… Read More

GBlog

Write From Home

Digital Root of a given large number using Recursion

Given a large number num in the form of string with length as N, the task is to find its digital root. The digital root… Read More

ACM-ICPC

large-numbers

number-digits

root

DSA

Mathematical

Recursion

Strings

Minimum increment or decrement required to sort the array | Top-down Approach

Given an array arr[] of N integers, the task is to sort the array in increasing order by performing a minimum number of operations. In… Read More

Algorithms

Arrays

DSA

Dynamic Programming

Recursion

Sorting

Find the Sum of the series 1, 2, 3, 6, 9, 18, 27, 54, … till N terms

Given a number N, the task is to find the sum of the below series till N terms. Examples: Input: N = 8 Output: 201 1 +… Read More

series

series-sum

DSA

Mathematical

School Programming

Count maximum occurrence of subsequence in string such that indices in subsequence is in A.P.

Given a string S, the task is to count the maximum occurrence of subsequences in the given string such that the indices of the characters… Read More

arithmetic progression

Algorithms

Bit Magic

Competitive Programming

DSA

Dynamic Programming

Recursion

Strings

Maximize the sum of array after multiplying a prefix and suffix by -1

Given an array arr[] of length N, the task is to maximize the sum of all the elements of the array by performing the following… Read More

Algorithms

Arrays

DSA

Dynamic Programming

Greedy

Python IMDbPY – Retrieving movie using movie ID

In this article we will see how we can retrieve the data of movie using its movie ID, movie id is the unique id given… Read More

Python IMDbPY-module

Python

Get current Gold price using Python

In this article we will see how we can get the current gold price in India. There is a variation in price of gold with… Read More

Python web-scraping-exercises

Python-BS3

Web-scraping

Python

Difference between Printer and Scanner

1. Printer : A printer is an external hardware output device whose work is to acquire the text and graphics output from the computer and… Read More

computer-graphics

Picked

Write From Home

Active Databases

An active Database is a database consisting of a set of triggers. These databases are very difficult to be maintained because of the complexity that… Read More

DBMS

Write From Home

Largest palindrome which is product of two N-digit numbers : Set 2

Given a value N, find out the largest palindrome number which is the product of two N-digit numbers.Examples: Input: N = 2 Output: 9009 Explanation: 9009 is the… Read More

factor

Number Divisibility

number-digits

palindrome

Analysis of Algorithms

DSA

Java

Mathematical

Puzzles

Maximum CPU Load from the given list of jobs

Given an array of jobs with different time requirements, where each job consists of start time, end time and CPU load. The task is to… Read More

min-heap

Advanced Data Structure

Algorithms

Competitive Programming

DSA

Heap

Python OpenCV – Affine Transformation

OpenCV is the huge open-source library for computer vision, machine learning, and image processing and now it plays a major role in real-time operation which… Read More

Image-Processing

OpenCV

Python-OpenCV

Internship

Project

Python

Python Programs

Write From Home

Minimum window size containing atleast P primes in every window of given range

Given three integers X, Y and P, the task is to find the minimum window size K such that every window in the range [X,… Read More

math

Prime Number

Algorithms

Competitive Programming

Divide and Conquer

DSA

Dynamic Programming

Mathematical

Searching

XOR of pairwise sum of every unordered pairs in an array

Given an array arr[] of length N, the task is to find the XOR of pairwise sum of every possible unordered pairs of the array.… Read More

Bitwise-XOR

Algorithms

Bit Magic

Competitive Programming

DSA

Greedy

Mathematical

Searching

Maximum size of square such that all submatrices of that size have sum less than K

Given an N x M matrix of integers and an integer K, the task is to find the size of the maximum square sub-matrix (S… Read More

Algorithms

Competitive Programming

DSA

Dynamic Programming

Greedy

Matrix

Searching

Find maximum subset sum formed by partitioning any subset of array into 2 partitions with equal sum

Given an array A containing N elements. Partition any subset of this array into two disjoint subsets such that both the subsets have an identical… Read More

subset

Algorithms

Competitive Programming

DSA

Dynamic Programming

Recursion