String = "ABB"; // Result is --> A AB ABB AB B BB B (You see AB twice as well as letter B). java array recursion mathematics combinatorics. if (sum == 0) {. Insert the current element of the input array in the subset and call the recursive function with the next element. As each recursion call will represent subset here, we will add resultList (see recursion code below) to the list of subsets in each call. It will take O(2^N) time complexity. For each element in the input array, we have 2 options. (Think!). edit close. For Example. Find all subsets of an array C++. For example if we write it with C, we are allowed just to use stdio.h or for C++, only

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