Bloomberg interview question

How do you write an algorithm to count all subsets of strings in a string.

Interview Answers

Anonymous

8 Nov 2015

int count(string &s) { return pow(2,s.size()); }

Anonymous

9 Mar 2017

Both answers above are incorrect, as there can be repeats.

1

Anonymous

14 Jul 2017

So, what's the answer if all previous answers were wrong?

Anonymous

18 Jul 2017

sort the character array for the string then employ the algorithm to find all subsets without duplicates (backtracking algorithm) but don't actually store the result strings just count the number of them.