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This PR adds an implementation of the Product Except Self problem in Python.
The algorithm returns an array where each element is the product of all numbers in the input except the one at that index — without using division and in O(n) time.
Key Details:
Algorithm Used: Prefix & Suffix product technique
Time Complexity: O(n)
Space Complexity: O(1) (extra space ignored for output array)
Approach:
Compute prefix products while traversing left → right.
Track a running suffix product while traversing right → left.
Multiply prefix × suffix for each index to get the result.
Also includes an alternate version using explicit prefix/suffix arrays for clarity.
Files Added:
product_except_self.py → Main implementation with docstrings, examples, and an optional extra-space version.