I have done competitive programming for quite a few years. It has been a wonderful experience and I liked it a lot.
Now that I am retiring, I was going through all of my resources that I organized for contests. Interestingly, I have implemented, written and collected quite a few algorithms, notes and techniques. Since it won't be of any use for me anymore, I thought of sharing it with the Codeforces community.
Many of the codes are collected from many awesome people of Codeforces. Thank you all.
Codes were at-least submitted once to any online judge. But I would suggest to test it for yourself.
Here is the link: competitive-programming-library