Module Introduction to combinatorics

Introduction to combinatorics

**Frequency: 7/10** Combinatorics problems are quite common in Competitive Programming.

Resources

Tài liệu Tiếng Anh: - [CP Algorithms: Binomial Coefficients](https://cp-algorithms.com/combinatorics/binomial-coefficients.html) - [CP Algorithms: Stars and bars](https://cp-algorithms.com/combinatorics/stars_and_bars.html)

Problems

Binomial coefficient 128 / 163 1000
Fork and knife 97 / 100 1100
Binomial coefficient 2 67 / 78 1100
Equation 71 / 78 1300
Array rearrangement 69 / 72 1300
Value of subsequences 56 / 61 1400
Inequation 44 / 44 1400
Growing mushrooms 51 / 52 1500
Binary matrix 26 / 32 1600
Broken board 12 / 15 1600
Triangles counting 10 / 25 1800
Restricted path 14 / 15 2000