LeetCode 78 Subsets: Generate Power Set Using Iterative Expansion

LeetCode problem 78 asks developers to return all possible subsets, known as the power set, from an integer array of unique elements. The solution begins by initializing a list containing an empty subset, which serves as the base case. For each number in the input array, new subsets are generated by appending that number to every existing subset. These newly formed subsets are then added to the main list, progressively building the complete power set. This iterative approach efficiently produces all 2ⁿ subsets without duplicates for an array of n unique elements.