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 153 / 191 1000
Fork and knife 118 / 123 1100
Binomial coefficient 2 86 / 100 1100
Equation 90 / 97 1300
Array rearrangement 93 / 95 1300
Value of subsequences 73 / 81 1400
Inequation 60 / 63 1400
Growing mushrooms 65 / 67 1500
Binary matrix 34 / 44 1600
Broken board 19 / 23 1600
Triangles counting 13 / 29 1800
Restricted path 16 / 18 2000