Hi, here’s your problem today. This problem was recently asked by Apple:
Create a class that initializes with a list of numbers and has one method called sum. sum should take in two parameters, start_idx and end_idx and return the sum of the list from start_idx (inclusive) to end_idx` (exclusive).
You should optimize for the sum method.
Here’s the class:
class ListFastSum: def __init__(self, nums): self.nums = nums def sum(self, start_idx, end_idx): # Fill this in. print(ListFastSum([1, 2, 3, 4, 5, 6, 7]).sum(2, 5)) # 12 because 3 + 4 + 5 = 12