permutation

问题 I am wondering if I can parallelize this code using OpenMP. Will OpenMP make the code run faster? Is there a better way to achieve this? vector<int> t; // already initialized do{ // Something with current permutation } while(next_permutation(t.begin(), t.end())); I know I can easily parallelize a for instruction, but here I have a while (condition = true) . 回答1: next_permutation produces permutations in lexicographical order, which means that the prefixes to the permutations produced are also

问题 Hi all , I know this question looks similar to some others but I have trawled through them extensively and can't get them to work for me. I have 16 datasets, let's call them 1 to 16. I would like to iterate through every possible different way of collecting these 16 into 4 groups; the most basic example being : [1,2,3,4][5,6,7,8][9,10,11,12][13,14,15,16]. The Question is how can I best iterate throught these combinations (in vba)? Below I have provided a more detailed example to help

问题 The problem: I would like to generate a list of permutations of strings in lexigraphical but excluding string inversions. For instance, if I have the following string: abc, I would like to generate the following list abc acb bac instead of the typical abc acb bac bca cab cba An alternative example would look something like this: 100 010 instead of 100 010 001 Currently, I can generate the permutations using perl, but I am not sure on how to best remove the reverse duplicates. I had thought of

问题 I found this excellent code which generates all the combinations of multiple arrays here: JavaScript - Generating combinations from n arrays with m elements I am now looking to go a step further and I would like to generate all the combinations of a number of JSON objects containing arrays For example if I have the two objects within an array seen below: [{"Footprint_Shape":["L-Shape","H-Shape","T-Shape"]}, {"Num_of_Floors":[1,2]}] I would like to produce the array below which is every

问题 I've looked all over SO for an answer to this, and while I've found a few similar problems, I just haven't been able to solve my problem. I'm building a Mastermind game. Right now I'm working on the algorithm for an intelligent computer guess. I've read about this a lot, but as someone fairly new to programming, it's been a bit of a challenge to develop this algorithm (I'm using TDD). secret_code = %w(blue blue orange orange) guess = %w(orange blue red yellow) valid_colors = %w(blue green

问题 Hello I found some really great code from a couple years ago to create all possible combinations from multiple rows. It works great but as you try it with more data it returns a run time error 6 overflow. I am very new to VBA but am hoping that there is a way to split up or slow the process down to keep the macro running. My current data should produce 442,368 unique rows, which is a lot but well within the scope of excel's power. I will paste the vba code below. When you hit debug following

问题 I'm practicing for programming interviews, and I stumbled upon this question on GlassDoor: "Find the number of ways we can sum the items in the set to get our target value. Order matters." Apparently, the interviewer couldn't come up with an answer, but he left this comment on GlassDoor: "This was more of a math question than a programming question." This problem seems to be different than this one: Finding all possible combinations of numbers to reach a given sum. So my questions is: what is

问题 I am trying to make a list*list of all permutations from 1 to N Example: perm(3, X). -> X = [[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]] I am instead getting X = [1, 2, 3] X = [1, 3, 2] X = [2, 1, 3] X = [2, 3, 1] X = [3, 1, 2] X = [3, 2, 1] and having to keep hitting next. My question is how would I put all values of X into a list like the example run that I want. Here is my existing code: permHelp([],[]). permHelp(List,[H|Finish]):-delete(H,List,Rest),permHelp(Rest

问题 This question already has an answer here : mixed combinations / permutations from different sets (1 answer) Closed last year . I am new to R and I am a little confused. Suppose I have a vector of c(1,2,3,4,5,6). I would like to generate permutations with four elements and every permutation should involve 1 and 5. Thank you. 回答1: You can use permutations() from the gtools package to get the permuations, and filter_all() from dplyr to get just the ones with 1 and 5: library(gtools) library

问题 Given two permutations: v1 [1] 4 3 1 5 2 v2 [1] 2 3 4 5 1 How do you compute the Spearman's footrule distance (total displacement of all elements) with base R? (flexible for any two permutations of size n ) For example, for these two vectors, it's as follows: 1 is moved 2 places from v1 to v2 2 is moved 4 places from v1 to v2 3 is moved 0 places from v1 to v2 4 is moved 2 places from v1 to v2 5 is moved 0 places from v1 to v2 So the total distance would be: 2+4+0+2+0 = 8 回答1: Here is a method