combinatorics | 易学教程

Making combinations in python

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问题 I have four values age = 23 gender = "M" city ="Delhi" religion = "Muslim" I need these arranged by every combination with empty values like - 23 * * * 23 M * * 23 M Delhi * 23 M Delhi Muslim * M * * * M Delhi * * M Delhi Muslim * * Delhi * * * Delhi Muslim * * * Muslim * * * * I need this arranged by the number of dimensions in ascending order in a list. So combinations with one value should be on top. I have some 30+ attributes, so i need an automated way to do this in Python Any ideas ?

Creating Combinations of Elements

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I want to create product option system. I have a form look like this: Form's inputs are tag inputs. First input is option name. When you put any option name the new tag input added in the form. My problem: I can't create combinations in controller because the inputs name an quantity will be random. Current Code: I found this code but i cant customize it for my system First inputs code id: when i post data goes to controller post it another blade. i incude this in my page In controller public function sendd(Request $request){ $a = $request['data']; return view ('system.modules.variations',

What category of combinatorial problems appear on the logic games section of the LSAT?

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问题 EDIT : See Solving "Who owns the Zebra" programmatically? for a similar class of problem There's a category of logic problem on the LSAT that goes like this: Seven consecutive time slots for a broadcast, numbered in chronological order I through 7, will be filled by six song tapes-G, H, L, O, P, S-and exactly one news tape. Each tape is to be assigned to a different time slot, and no tape is longer than any other tape. The broadcast is subject to the following restrictions: L must be played

Possible NxN matrices, t 1's in each row and column, none in diagonal?

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问题 Background: This is extra credit in a logic and algorithms class, we are currently covering propositional logic, P implies Q that kind of thing, so I think the Prof wanted to give us and assignment out of our depth. I will implement this in C++, but right now I just want to understand whats going on in the example....which I don't. Example Enclosed is a walkthrough for the Lefty algorithm which computes the number of nxn 0-1 matrices with t ones in each row and column, but none on the main

Seeking a solution or a heursitic approxmation for the 3-partition combinatorial situation

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问题 How do I distribute 48 items each with its own dollar value to each of 3 inheritors so that the value given to each is equal or nearly equal? This is a form of partitioning problem with is NP-complete (or some such) and therefore impossible to perfectly answer with 48 items. I'm looking for a practical and generally acknowledged approximate algorithm to do this. It's a problem faced by many in resolving wills and estates. Answer must be out there somewhere! The answer could be a computer

How do I iterate over a large number of tuples of integers in the order of their sum?

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问题 I'm using itertools.combinations() to iterate over tuples of integers. I am interested in the tuple with the lowest sum that satisfies some conditions: def findLowestNiceTuple: for tup in itertools.combinations(range(1, 6), 2): if niceTuple(tup): return tup The generator's default order is not in the order of the elements' sum. For example: >>> itertools.combinations(range(1, 6), 2) gives a generator which will yield the following elements: [(1, 2), (1, 3), (1, 4), (1, 5), (2, 3), (2, 4), (2,

Word ranking efficiency

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问题 I am not sure how to solve this problem within the constraints. Consider a "word" as any sequence of capital letters A-Z (not limited to just "dictionary words"). For any word with at least two different letters, there are other words composed of the same letters but in a different order (for instance, STATIONARILY/ANTIROYALIST, which happen to both be dictionary words; for our purposes "AAIILNORSTTY" is also a "word" composed of the same letters as these two). We can then assign a number to

a variation of TSP : limit time, visit as many nodes as possible

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问题 again let's use the salesman context: if the salesman is not required to visit ALL customers, but is given a time constraint, in which he must vist as many customers as possible. how can we find the best route? an even more slightly advanced version is, say each customer is marked with a monetary gain, so our salesman wants to maximize the total monetary gain from those customers that he actually visits, as long as he finishes visiting them within the time constraint I tried to search for

How can I calculate n-th permutation (or tell the lexicographic order of a given permutation)? [duplicate]

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问题 This question already has answers here : Ranking and unranking of permutations with duplicates (4 answers) Closed 4 years ago . This question has two parts, though since I'm trying to compe up with a Prolog implementation, solving one will probably immediately lead to a solution of the other one. Given a permutation of a list of integers {1,2,...,N} , how can I tell what is the index of that permutation in lexicographic ordering? Given a number k , how can I calculate k -th permutation of

Generate Combinations of generic list

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问题 I need to create a list from another list that contains every combination possible. In researching possible solutions I have found many interesting approaches but all seem to generate results based on the count of records provided. I need the combinations to increase to a max threshold. i.e. consider the following array 1,2,3,4,5 I need the results to look similar to (threshold is 3 in this example) 1 1,2 1,2,3 1,2,4 1,2,5 1,3,4 2,3,5... etc In actuality, the data will be IEnumerable. I used