Rajan Kumar

work Founder & Programmer at HackersFriend

location_on India

code Python, HTML, CSS, Django, JavaScript, Competitive programming

public https://www.hackersfriend.com

HackersFriend @rajan ( Joined 1 year, 7 months ago )


Bio: Loves to code.




Rajan Kumar

rajan published an article

April 3, 2020 ⋅ 71 views


How to upload file to SQL server using pyodbc python


Rajan Kumar

rajan published an article

March 27, 2020 ⋅ 197 views


Python - Text to Speech by using pyttsx3


Rajan Kumar

rajan published an article

March 27, 2020 ⋅ 227 views


Building a news headlines player using Python and text to speech


Rajan Kumar

rajan published an article

April 4, 2020 (Updated April 4, 2020) ⋅ 40 views


How to redirect using javascript


Rajan Kumar

rajan published an article

March 29, 2020 (Updated March 30, 2020) ⋅ 154 views


How to prepare for Hack With Infy 2020


Rajan Kumar

rajan published an article

March 22, 2020 (Updated March 24, 2020) ⋅ 105 views


Filtering empty or NULL values in a Django queryset


Rajan Kumar

rajan published an article

Jan. 25, 2020 (Updated March 9, 2020) ⋅ 29 views


forEach() Vs map() in JavaScript - Things every developer should know


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 16, 2020) ⋅ 6 views


Convert a number to a string in C - best way


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 12, 2020) ⋅ 178 views


Building news aggregator web app with Django using python web scraping


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 14 views


Find Length of a Linked List


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 21 views


Sort string of characters C++


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 23 views


Print a matrix in spiral form


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 6, 2020) ⋅ 6 views


Print reverse of a string using recursion


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 5, 2020) ⋅ 62 views


Amazon Product Price tracking using Python


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 17 views


Program to find the mid-point of a line


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 21 views


Generate QR Code using python with pyqrcode module


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Dec. 27, 2019) ⋅ 25 views


Mouse and keyboard automation using Python


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 7 views


C++ Trigonometric functions


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 11 views


Remove one element to maximize XOR of array


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Dec. 6, 2019) ⋅ 14 views


Algorithms and Maths you need to know for hard level competitive programming problems


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Dec. 2, 2019) ⋅ 16 views


C++ Hacks for Competitive programming


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 21, 2019) ⋅ 23 views


Add two numbers without using arithmetic operators


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 19, 2019) ⋅ 14 views


Efficient Method to Check if a Number is Multiple of 3


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 18, 2019) ⋅ 43 views


DNA to Protein Converter using Python 3 and Django 2.1


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 16, 2019) ⋅ 21 views


Step by step guide to improve competitive programming skills


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 13, 2019) ⋅ 25 views


Implement a Dictionary using Trie


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Nov. 9, 2019) ⋅ 6 views


Range Trees


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Oct. 19, 2019) ⋅ 111 views


How to prepare for Google Kickstart – a CodeJam competition?


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Sept. 28, 2019) ⋅ 15 views


HackersFriend Graduated from Y Combinator's Startup School


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Aug. 17, 2019) ⋅ 7 views


Find maximum occurring character in a string


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Aug. 16, 2019) ⋅ 22 views


Sort an array without changing position of negative numbers


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Aug. 14, 2019) ⋅ 20 views


What is Binary Search Tree (BST) ?


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Aug. 13, 2019) ⋅ 16 views


Merge two Binary search Trees with constant extra space


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Aug. 2, 2019) ⋅ 54 views


How to generate OTP (One time password) using python


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 25, 2019) ⋅ 20 views


Get current weather of any city with python using openweathermap API


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 25, 2019) ⋅ 80 views


Getting real time currency exchange rate using Python


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 23, 2019) ⋅ 8 views


Find prime numbers in the first half and second half of an array


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 18, 2019) ⋅ 7 views


Django optimizing Database queries


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 16, 2019) ⋅ 20 views


Check whether two strings contain same characters in same order


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 16, 2019) ⋅ 59 views


Count duplicates in a given linked list


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 13, 2019) ⋅ 22 views


Function Pointers in C++


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 12, 2019) ⋅ 31 views


Remove an element to maximize the GCD of a given array


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated July 9, 2019) ⋅ 44 views


Find Sum of all Submatrices of a Given Matrix


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated June 6, 2019) ⋅ 11 views


Length of longest sub-array with maximum arithmetic mean


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated May 29, 2019) ⋅ 21 views


Learn Full stack development from scratch part - 1 ( step by step guide )


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 23, 2019) ⋅ 8 views


Shuffle elements of an Array most efficient way , Fisher Yates shuffle algorithm


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 13 views


Top 10 jobs that will have high demand in future


Rajan Kumar

rajan published an article

Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 19 views


Top 5 Tv shows Programmers must watch