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What is Subarray Sums Interview Question about?

This document describes an interview question involving finding the sum of all subarrays of an input array. It provides 3 potential solutions: 1) A brute force O(n3) solution using nested loops. 2) An optimized O(n2) solution that incrementally builds subarray sums. 3) An O(n) solution that uses mathematical patterns to count how many times each element appears in subarrays and directly calculates the sum. It also discusses follow-up questions and potential bugs to watch out for.

Author

Surya

Language

EN