Countdown - codepath/compsci_guides GitHub Wiki

Unit 1 Session 1 (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• Will m and n always be positive integers?
  • Yes.
• Will n ever be larger than m?
  • No.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Create a function that takes parameters n and m and counts down the numbers from m down to n.

1) Loop through the numbers starting at `m`, ending at `n`, and stepping -1 each time
2) Print each number

⚠️ Common Mistakes

• Make sure your loop includes the first number and the final number!
• How can you tell range() to step -1 each time?

I-mplement

def countdown(m, n):
	for num in range (m, n-1, -1):
		print(num)