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$ curl repovive.com/roadmaps/math-fundamentals/counting-principles

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$ curl repovive.com/roadmaps/math-fundamentals/counting-principles

Lessons

1. Intro

2. Why Counting Matters

3. The Sum Rule

Ready to start learning?

4. Sum Rule Example

5. The Product Rule

6. Product Rule Example

7. When to Add vs Multiply

8. Mixed Example

9. Problem - Count Passwords

10. Password Count - Solution

11. Password Variants

12. Counting Paths on Grids

13. Counting Strings

14. Counting with Restrictions

15. At Least One Constraint

16. Double Counting Principle

17. Pigeonhole Principle

18. Pigeonhole Example

19. Inclusion-Exclusion Principle

20. Inclusion-Exclusion Example

21. Counting in Practice

22. What Comes Next

23. Overcounting and Correction

24. Counting Subsets

25. Counting Binary Strings

26. Counting with Forbidden Positions

27. Counting Divisors

28. Problem - Climbing Stairs

29. Climbing Stairs - Insight

30. Climbing Stairs - Implementation

31. Problem - Unique Paths

32. Unique Paths - The Formula

33. Unique Paths - Implementation

34. Lessons from Unique Paths

35. Problem - Unique Paths II

36. Unique Paths II - Handling Obstacles

37. Unique Paths II - Implementation

38. Lessons from Unique Paths II

39. Problem - Letter Combinations

40. Letter Combinations - Counting First

41. Letter Combinations - Implementation

42. Lessons from Letter Combinations

43. Section Recap