A huge number of coding interview problems involve dealing with Permutations and Combinations of a given set of elements. The pattern Subsets describes an efficient Breadth First Search (BFS) approach to handle all these problems. This type of problems can be solved by two different approaches 1. Backtracking Approach - It's a recursive approach where we backtrack each solution after appending the subset to the resultset.  Time Complexity: O(2^n)  Space Complexity: O(n) for extra array subset. Write java code.

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