Product of Array Except Self

TIME: O(n)
SPACE: O(1)

Problem Statement

Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. You must solve this in O(N) time and without using division.

Real Engineering Applications

In production systems, this concept directly maps to caching index layers, route lookups optimizations, compiler scope parsing validations, and multi-thread dependency schedulers.

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