Computers and Technology, 05.07.2019 18:20, bosanchez

Sometimes we want only the k-subsets of s – that is, the subsets with cardinality k. for example, consider a pizza joint that offers 16 different toppings. call this set of 16 toppings t. the power set p(t) represents all possible combinations of toppings; there are 216 = 65,536 combinations. a customer who wants a 3-topping pizza would be interested in only the 3-subsets of t; it turns out that there are only 560 such subsets. (later in the course, we’ll discuss how to compute the count of k-subsets without actually finding the subsets! )
so how do we find all the k-subsets of a set s? one obvious way is to start by finding p(s), which gives us all possible subsets. then we can just iterate through all the subsets and include only those with a cardinality of k.
write a python function k subsets naive(s, k) that calls your previously written power set function to return a set containing all the k-subsets of s. again, represent the sets using python lists. for example, calling k subsets naive([4, 5, 6], 2) should return something like [[4, 5], [4, 6], [5, 6]]. if k is not valid (i. e., negative, or greater than |s|), this function should return the empty list, [].

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Sometimes we want only the k-subsets of s – that is, the subsets with cardinality k. for example, co...