Flip Signs - codepath/compsci_guides GitHub Wiki

Unit 1 Session 2 (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 the list always contain only numbers?
  • Yes.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Loop through a list, and generate a new list containing the flipped sign of each element.

1) Create a function with parameters for the list
2) Make an empty list to store the results
3) Loop through the input list
  a) Multiply the element by -1
  b) Add the new value to the results list
4) Return the results list

I-mplement

def flip_sign(numbers):
	flipped = []
	for num in numbers:
		flipped.append(num * -1)
	return flipped