All Hard Articles

Sum of series with alternate signed squares of AP

We are given the Integer n and also in the next line 2*n integers which represent a Arithmetic Progression series a1, a2, a3…a2n they are… Read More

arithmetic progression

series

series-sum

DSA

Mathematical

P – smooth numbers in given ranges

Given multiple ranges [L, R] and a prime number p, we need to find all P-smooth numbers in given individual ranges. What is P –… Read More

prime-factor

DSA

Mathematical

Misc

Python

Permutation of numbers such that sum of two consecutive numbers is a perfect square

Prerequisite: Hamiltonian Cycle Given an integer n(>=2), find a permutation of numbers from 1 to n such that the sum of two consecutive numbers of… Read More

maths-perfect-square

number-theory

DSA

Graph

Print 1 2 3 infinitely using threads in C

Print 1 2 3 infinitely using thread. Create three threads viz T1, T2, and T3 such that those should print 1 2 3 sequence infinitely.… Read More

cpp-multithreading

Processes & Threads

C Language

Misc

PayTm Interview Experience | Set 23 (For 2 Years Experienced)

Round 1: First round was taken on mettl, online judge. There was two questions and that required to be done in 1hr 1. A paragraph… Read More

Paytm

Experienced

Experiences

Interview Experiences

Converting seconds into days, hours, minutes and seconds

Given an integer n(in seconds).Convert it into days, hours, minutes and seconds.Examples: Input : 369121517Output : 4272 days 5 hours 45 minutes 17 secondsInput :… Read More

Basic Coding Problems

date-time-program

DSA

Mathematical

Misc

Publicly inherit a base class but making some of public method as private

There are certain situation when we want to make some of the public base class functions as private in the derived class. Suppose both base… Read More

cpp-inheritance

C++

C/C++ Puzzles

Number of Pentagons and Hexagons on a Football

Given a standard football, regular hexagons and pentagons are drawn on it as shown in the picture. Find out the number of hexagons and pentagons.… Read More

Shape Puzzles

DSA

Engineering Mathematics Questions

Geometric

Puzzles

Flipkart Interview Experience | Set 50 (Off-campus)

This was a drive for SDE-1 and SDE-2 . HackerRank Round: This was an one hour test with two questions on hackerrank platform Given a… Read More

Flipkart

DSA

Experiences

Hash

Interview Experiences

Strings

Sum over Subsets | Dynamic Programming

Prerequisite: Basic Dynamic Programming, Bitmasks Consider the following problem where we will use Sum over subset Dynamic Programming to solve it. Given an array of 2n integers,… Read More

Bit Algorithms

Advanced Data Structure

DSA

Puzzle | Four Glasses and Blindfold

Puzzle: Four glasses are placed on the corners of a square plate which can rotate about its center. Glasses are either upright (up) or upside-down… Read More

Logical Puzzles

Misc

Puzzles

Oyo Rooms Interview Experience | Set 9

Round 1 : This was online coding round consisting of 2 coding questions each of 100 marks and 15 objective questions each of 2 marks.If… Read More

Experiences

Interview Experiences

Microsoft Interview experience | Set 162 (For Front End Developer)

I applied through an employee referral. The process took around 2 weeks. I was interviewed at Microsoft (Bangalore) in November 2017. Mainly they wanted developers… Read More

Microsoft

Experiences

Interview Experiences

Primality Test using Lucas-Lehmer Series

In this article, we will discuss the Lucas-Lehmer series which is used to check the primality of prime numbers of the form 2p – 1… Read More

number-theory

Prime Number

DSA

Mathematical

Closest Palindrome Number (absolute difference Is min)

Given a number N. our task is to find the closest Palindrome number whose absolute difference with given number is minimum and absolute difference must… Read More

number-digits

palindrome

DSA

Strings

Program to print Square inside a Square

Given a number N, print a hollow square of side with N asterisks(‘*’), and inside it print a hollow square of side N-4 asterisks(‘*’).Examples : … Read More

Basic Coding Problems

pattern-printing

C Programs

DSA

Program to Implement NFA with epsilon move to DFA Conversion

Non-deterministic Finite Automata (NFA) : NFA is a finite automation where for some cases when a single input is given to a single state, the… Read More

Theory of Computation

ixigo Interview Experience | For SDE2 Backend

I have around 3 years and 4 months of experience as a software developer. I recently interviewed with ixigo for the position of SDE2 backend… Read More

ixigo

Advanced Data Structure

Algorithms

Binary Search Tree

DSA

Experienced

Experiences

Interview Experiences

Java

Mathematical

Pattern Searching

Adobe Interview Experience | Set 55 (On-Campus Full Time for MTS profile)

Adobe came in our college for MTS (Member of Technical Staff profile). Round 1: This was an online round conducted on Hackerrank platform.It had 3… Read More

Adobe

Experiences

Interview Experiences

Implementation of Binomial Heap | Set – 2 (delete() and decreseKey())

In previous post i.e. Set 1 we have discussed that implements these below functions: insert(H, k): Inserts a key ‘k’ to Binomial Heap ‘H’. This… Read More

Data Structures-Heap

Advanced Data Structure

DSA

Heap