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Not sure if I understood the first question right. But if all we want is the number of subarrays with less than K and not the actual subarrays themselves, doesn't it make sense to do one for loop to retrieve the count of elements that fit this criterion (let's call the count M) and return 2^M - 1? The -1 part is to exclude empty lists.
- jdoesv April 19, 2021