permutation

问题 I am writing some quiz game and need computer to solve 1 game in the quiz if players fail to solve it. Given data : List of 6 numbers to use, for example 4, 8, 6, 2, 15, 50. Targeted value, where 0 < value < 1000, for example 590. Available operations are division, addition, multiplication and division. Parentheses can be used. Generate mathematical expression which evaluation is equal, or as close as possible, to the target value. For example for numbers given above, expression could be : (6

问题 I am writing some quiz game and need computer to solve 1 game in the quiz if players fail to solve it. Given data : List of 6 numbers to use, for example 4, 8, 6, 2, 15, 50. Targeted value, where 0 < value < 1000, for example 590. Available operations are division, addition, multiplication and division. Parentheses can be used. Generate mathematical expression which evaluation is equal, or as close as possible, to the target value. For example for numbers given above, expression could be : (6

问题 I am writing some quiz game and need computer to solve 1 game in the quiz if players fail to solve it. Given data : List of 6 numbers to use, for example 4, 8, 6, 2, 15, 50. Targeted value, where 0 < value < 1000, for example 590. Available operations are division, addition, multiplication and division. Parentheses can be used. Generate mathematical expression which evaluation is equal, or as close as possible, to the target value. For example for numbers given above, expression could be : (6

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 8 years ago . I am working on a project. I found this code regarding permutations on the Interwebz. I would like to use it as a basis for writing my own code. However,

问题 I'm looking into a way of efficiently creating a derangement (and conversely specific permutations) of a vector in R. As far as I've seen, there's no base function that does that and also there's not much about it here on SO. An obvious start is sample which creates a permutation of a vector. But I need this permutation to have no fixed points, hence be a derangement of the vector. For a nice explanation of this topic, see this Cross Validated post. This is my first approach: derangr <-

问题 For example I have this set k=5 of elements [1,2,3,4,5] and I want all permutations of length n=2 . 1,2 1,3 1,4 1,5 2,1 etc etc. Thing is i can't use STL, external math libraries etc. I've been sitting on this problem for about 3 days now and im about to go crazy. What i tried is generating all permutations of all the elements using Heap's algorithm, and then all the permutations of n elements where contained in the first n numbers of all k-permutations and i could just truncate and delete

问题 I would like to calculate all possible combinations in an array of digits (0 to 9), uppercase letters (A to Z) and lowercase letters (a to z). Array contain only 10 digits or letters at time. I'm trying this in vb.net but I found it a little confusing. Anyone have an idea how to do this? 回答1: Here's an iterative approach that would allow you to start the sequence from any position. This way you could stop the sequence, store the current value, then later restart it from the same position even

问题 I am looking to use R's expand.grid to comprehensively enumerate and investigate options for hierarchical clustering analysis. I have a final function acc which will take a matrix and analyse it for performance measures like accuracy, precision, F1 etc., returning a named list (with accuracy, F1, etc.): the ultimate output I'm looking for is a table where all the hyperparameter combinations are listed and, in columns next to them, the different performance measures (accuracy, F1,...). The

问题 e.g. A permutation algorithm for {&, *, %} to be placed in 8 positions: &&&&&&&&& &&&&&&&&* &&&&&&&&% &&&&&&&*% &&&&&&&** ... Heap's permutation algorithm I saw on the Internet works just for those who the number of characters are equal to the number of positions, And those who can work with unequal number of characters and number of positions, Only work with integers, Not characters. I also have to say I haven't reached any working algorithm up to now, As I don't know anything about

问题 e.g. A permutation algorithm for {&, *, %} to be placed in 8 positions: &&&&&&&&& &&&&&&&&* &&&&&&&&% &&&&&&&*% &&&&&&&** ... Heap's permutation algorithm I saw on the Internet works just for those who the number of characters are equal to the number of positions, And those who can work with unequal number of characters and number of positions, Only work with integers, Not characters. I also have to say I haven't reached any working algorithm up to now, As I don't know anything about