Daily Coding Problem: Problem #1703 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by Goldman Sachs.

Given a list of numbers L, implement a method sum(i, j) which returns the sum from the sublist L[i:j] (including i, excluding j).

For example, given L = [1, 2, 3, 4, 5], sum(1, 3) should return sum([2, 3]), which is 5.

You can assume that you can do some pre-processing. sum() should be optimized over the pre-processing step.

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