Product of Last K Numbers | Prefix Product Optimization | JavaScript Coding Interview Question

Learn how to design an algorithm to efficiently get the product of the last K numbers from a stream of integers using prefix multiplication and zero handling. This JavaScript solution is optimized for O(1) queries.
🔹 Data Structure: Prefix Product Array
🔹 Time Complexity: O(1) per operation
🔹 Handles zeros efficiently
📘 Example covered from LeetCode 1352 – Product of the Last K Numbers

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