All Hard Articles

Lexicographic rank of a string with duplicate characters

Given a string s that may have duplicate characters. Find out the lexicographic rank of s. s may consist of lower as well as upper… Read More

factorial

DSA

Strings

Difference between Simple and Complex View in SQL

A View in SQL as a logical subset of data from one or more tables. Views are used to restrict data access. A View contains… Read More

DBMS

Difference Between

SQL

C++ program for Solving Cryptarithmetic Puzzles

Newspapers and magazines often have crypt-arithmetic puzzles of the form: Examples: Input : s1 = SEND, s2 = "MORE", s3 = "MONEY" Output : One… Read More

Backtracking

C++ Programs

DSA

Different Types of Clustering Algorithm

The introduction to clustering is discussed in this article and is advised to be understood first. The clustering Algorithms are of many types. The following… Read More

Computer Subject

Machine Learning

How to Compare Files Line by Line in Linux | diff Command

In the world of Linux, managing and comparing files is a common task for system administrators and developers alike. The ability to compare files line… Read More

linux-command

Linux-text-processing-commands

Linux-Unix

K maximum sums of overlapping contiguous sub-arrays

Given an array of Integers and an Integer value k, find out k sub-arrays(may be overlapping), which have k maximum sums. Examples: Input : arr… Read More

Order-Statistics

prefix-sum

Arrays

DSA

Dynamic Programming

Count ways to divide circle using N non-intersecting chords

Given a number N, find the number of ways you can draw N chords in a circle with 2*N points such that no 2 chords… Read More

circle

DSA

Dynamic Programming

Geometric

StringStream in C++ for Decimal to Hexadecimal and back

Stringstream is stream class present in C++ which is used for doing operations on a string. It can be used for formatting/parsing/converting a string to… Read More

base-conversion

cpp-input-output

cpp-string

cpp-stringstream

C++

C++ Programs

C/C++ Puzzles

Competitive Programming

DSA

Misc

Strings

TechTips

Find minimum moves to reach target on an infinite line

Given a target position on infinite number line, i.e -infinity to +infinity. Starting form 0 you have to reach the target by moving as described… Read More

Flipkart

Competitive Programming

DSA

Mathematical

IPC using Message Queues

Prerequisite : Inter Process Communication A message queue is a linked list of messages stored within the kernel and identified by a message queue identifier. A… Read More

system-programming

C Language

Operating Systems

Addition and Subtraction of Matrix using pthreads

Addition or Subtraction of matrices takes O(n^2) time without threads but using threads we don’t reduce the time complexity of the program we divide the… Read More

Algorithms

DSA

Mathematical

Matrix

Misc

Python | Remove and print every third from list until it becomes empty

Given a list of numbers, Your task is to remove and print every third number from a list of numbers until the list becomes empty.… Read More

Python list-programs

python-list

Python

Pythagorean Quadruple

Given four points, check whether they form Pythagorean Quadruple. It is defined as a tuple of integers a, b, c, d such that . They are basically… Read More

DSA

Geometric

Samsung R&D Interview Experience | Set 37 (For developer profile)

Samsung R&D Bengaluru, visited our campus for full time recruitment. There were 5 rounds in total. 1) Online coding round 2) GD 3) Technical round… Read More

Samsung

Experiences

Interview Experiences

Brent’s Cycle Detection Algorithm

Given a linked list, check if the linked list has loop or not. Below diagram shows a linked list with a loop. We have discussed… Read More

DSA

Linked List

Samsung Interview Experience | Set 36 (On-Campus)

Samsung Bangalore came to our campus to recruit for a software development engineer role. The following process took place. Round 1: Online test. The question… Read More

Samsung

Experiences

Interview Experiences

Project Idea (Augmented Reality – QR Code Scanner)

Project Idea : A project based on scanning and detecting qr codes and with inclusion of pose estimation for optimization in detection of qr code… Read More

Project

Python Dictionary | Check if binary representations of two numbers are anagram

Given two numbers you are required to check whether they are anagrams of each other or not in binary representation. Examples: Input : a =… Read More

base-conversion

Python dictionary-programs

python-dict

Python

GATE | GATE CS Mock 2018 | Set 2 | Question 35

What is output of following C – Code? #include <stdio.h> #include <stdarg.h> int fun(int n, ...) { int i, j = 1, val = 0;… Read More

GATE

Program to print diagonal star patterns

Time Complexity: O(N) where N is number of nodes in a given binary tree Auxiliary Space: O(N)For the given input, this program prints the following… Read More

Basic Coding Problems

pattern-printing

DSA