Hello guys i wish everything seems good .

I would like to share with you my playlist about "Principles and Techniques in Combinatorics in Arabic", in this playlist we will explain these Chapters:

1 — Permutations and Circular Permutations and Combinations.

2 — Binomial/Multinomial Coefficient and Chu Shih-Chieh's Identity.

3 — The pigeonhole principle and ramsey numbers.

4 — The principle of Inclusion and Exclusion.

5 — Generating Functions.

6 — Recurrence Relations.

In each video we will solve a lot of problems from International Mathematical Olympiad (IMO) and Asian Pacific Mathematics olympiad (APMO).

After each chapter there will be a video for Coding and contest that will contain some Inspirational problems and STREAM to upslove this contest.

I wish it helps you. Thanks guys, i am waiting for your feedback

Playlist link : Principles and techniques in combinatorics [Arabic]: https://www.youtube.com/watch?v=rOTwdvzLgVA&list=PLy-QKXxp9WnUBharNnIpA9o8GPqFqsoD1&ab_channel=AhmedTarek

The COMBINATIONS / chap 1 contest is running NOW! Harry up, and Solve these challenging problems. [Contest link] https://mirror.codeforces.com/contestInvitation/81a0ad55e7e2a39d9b6e3d0f90b17300ffd68b5c

And this template may helps you to solve.

[Combinatorics Class C++] https://github.com/atmoharam/CP-Templetes/blob/main/Combinatorics.cpp

I will add some functions while i explain topics.

THERE WILL BE A STREAM TO SOLVE THIS CONTEST Stay tuned!

Bitmasks Guide : Bitmasks in Arabic: https://www.youtube.com/watch?v=zh_y2qNS6bA&list=PLy-QKXxp9WnUXkttA_8VQyZTAkG_-H_jJ&ab_channel=AhmedTarek