Prefix Sum

Subarray Sum

Given an array of integers and an integer target, find a subarray that sums to target and return the start and end indices of the subarray. It's guaranteed to have a unique solution.

Input: 

1 -20 -3 30 5 4
7

Output: 1 4

Explanation: -20 - 3 + 30 = 7. The indices for subarray [-20,-3,30] is 1 and 4 (right exclusive).

Try it yourself

Title

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  >>> a = [1, 2, 3]
  >>> a[-1]
  3

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