I am having trouble generating all the possible sub-multisets of the letters in a hand for problem#4 in ps6. Can anyone give me a hint?

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I am having trouble generating all the possible sub-multisets of the letters in a hand for problem#4 in ps6. Can anyone give me a hint?

MIT 6.00 Intro Computer Science (OCW)
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If there are n letters in your hand there will be 2**n subsets. Half of them will include the first letter, the other half will omit it (and so on for all letters.) So one way is to create a recursive function which will generate all the subsets starting using letters from 0..k given a list of the subsets using letters from 0..k-1. At the bottom of your recursion, the subsets from 0..0 are "" and hand[0] (either the empty string or a string with the first letter.) Given the list of subsets using letters from 0..k-1, the sets from 0..k will be the same list of sets, and the same sets with the k-th letter added to each one. Alternately, you can do this completely iteratively by stepping through the 2**n possibilities as in subsets = [ ] for k in range(2**n): this_subset = "" Then decide that the j-th letter will be included in this k-th subset only if the j-th bit is set in the binary form of the number k. You can test this with if (k & (1<
Wow that really helps a lot!! Thanks so much!!

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