Product of All Array Elements Except Self
Explore how to compute an array where each element is the product of all other elements except itself. Understand the optimized technique involving left and right product arrays to achieve an O(n) time complexity. This lesson helps you solve a common coding interview problem efficiently while analyzing time and space trade-offs.
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].
Examples
Example 1
Sample input
nums = [1, 2, 3, 4]
Expected output
[24, 12, 8, 6]
Example 2
Sample input
nums = [-1, 1, 0, -3, 3]
Expected output
[0, 0, 9, 0, 0]
Try it yourself
Solution
Naive approach:
The naive solution ...