Recently, I’ve been revisiting the Poisson distribution, and honestly — it still feels a bit counterintuitive to me.

Thoughts surrounding Ballot Box problem and the extensions of it.

Recently, while reviewing the formula for the sum of a geometric series, I stumbled upon an unexpectedly elegant connection to a simple probability problem.

Notes on 50 Challenging Problems in Probability by Frederick Mosteller

Notes for Competitive Programming 4. A very good book.

Notes for Guestimathon by Lawrence Weinstein

Dream. Plan. Do.

健身日记

Interesting problem with a much easier solution using mathematical methods.

Easy question but I thought of it in a too difficult way.

I thought of a different approach to the question, not sure if it will work.

A simple dynamic programming question.

A simple problem on identifying prime numbers

I learned some basics of C/C++, including scanf and cin, how to use hashMap in C, etc.

My Very First CF problemset