Link

https://www.codechef.com/problems/ABROADS
https://codeforces.com/contest/160/problem/D
https://codeforces.com/contest/17/problem/B
https://codeforces.com/problemset/problem/744/A
http://tarsun23.blogspot.com/2013/05/find-indegree-and-outdegree-of-all.html
https://aaman007.wordpress.com/2017/10/11/indegree-outdegree-code/

https://www.geeksforgeeks.org/longest-subarray-sum-elements-atmost-k/

https://codeforces.com/blog/entry/22317

https://www.geeksforgeeks.org/count-divisors-n-on13/

https://discuss.codechef.com/t/calculate-number-of-factors-of-a-large-number/14504/7

https://www.geeksforgeeks.org/multiply-large-integers-under-large-modulo/

https://www.spoj.com/problems/SAS002/

https://codeforces.com/blog/entry/49494/

https://bit.ly/2YsU3RR

dijstkra :

https://codeforces.com/problemset/problem/715/B

Super ::

https://www.geeksforgeeks.org/python-super-in-single-inheritance/?ref=rp

https://www.geeksforgeeks.org/python-super-function-with-multilevel-inheritance/?ref=rp

html :

https://www.w3schools.com/tags/

https://www.geeksforgeeks.org/html-tutorials/

osthir link for html :

https://www.computerhope.com/learnhtm.htm

Sakib Link :

https://fs0.filessharing.net/e32afc8e3c549bff

Crispy Forms :

https://www.techiediaries.com/django-form-bootstrap/

user email verification :

https://medium.com/@shafikshaon/user-registration-with-email-verification-in-django-8aeff5ce498d

https://discuss.codechef.com/t/vaimin-editorial/18417