combinations

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: PHP take all combinations I'm thinking of making something in PHP that will show me all combinations of license plates. For example: You have 3 boxes you can fill in max 2 values Like BOX1 BOX2 BOX3 75 PM M5 7S PH MS Z5 PN H5 ZS RM HS 25 RH N5 2S RN NS NOT BOX1+BOX1+BOX1 It needs to show me ex. 75-PM-M5 ex. 75-PH-MS ex. 75-PN-MS ex. 75-PM-H5 ex. 75-PH-H5 ex. 75-PN-H5 So, BOX1+BOX2+BOX3 The PHP script needs to

问题 My task is to generates all possible combinations of that rows without the hidden # square. The input is XOXX#OO#XO and here is the example of what the output should be: XOXXOOOOXO XOXXOOOXXO XOXXXOOOXO XOXXXOOXXO I am only allowed to solve this solution iteratively and I am not sure how to fix this and have been working on this code for a week now.. any help would be much appreciated! Here is my code: import java.lang.Math; public class help { public static void main(String[] args) { String

问题 I am looking for a way to get all possible combinations consisting of exactly one element from each group. For my purposes, I do not care about the ordering of the elements. By that I mean {1,2} is the same as {2,1}. Suppose I had the following 4 groups: Group 1 = {e1, e2} Group 2 = {e3, e4} Group 3 = {e5, e6, e7} Group 4 = {e8} In this case, I think I would want (assuming that actually is all unique combinations) {e1, e3, e5, e8} {e1, e3, e6, e8} {e1, e3, e7, e8} {e1, e4, e5, e8} {e1, e4, e6

问题 I have an empty table with 7 BIT columns (A, B, C, D, E, F, and G). I am looking to populate this table with rows representing all possible combinations of these columns. Ideally there would be no rows containing duplicates of the exact same combinations. Although I am showing 7 columns here, the number of columns could be greater, so the solution should be scalable. A snippet of the table after being populated would look similar to below: Ideally this would be based on an INSERT statement,

问题 I have a set of numbers eg. [100,90,80,70,60,50] and want to find all combinations of size r=3 but in order of decreasing sum. Arranging the numbers in decreasing order does not work eg. (100, 90, 80) 270 (100, 90, 70) 260 (100, 90, 60) 250 (100, 90, 50) **240** (100, 80, 70) **250** (100, 80, 60) 240 How can i go about finding such a combination set with decreasing sum value. 回答1: Here' the Code import itertools array = [100,90,80,70,60,50] size = 3 answer = [] # to store all combination

问题 Starting with an odd list of students, let’s say 21 total: cohort = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] I want use Python to write a function that assign pairs for group projects every day with different pairings. Since we have an odd number of students, I don’t want anyone to be working alone, so we would need to have 9 groups of 2 people and 1 group of 3 people . Every day they would change partners. For example, on day 1 and day 2, the groups would

问题 Starting with an odd list of students, let’s say 21 total: cohort = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] I want use Python to write a function that assign pairs for group projects every day with different pairings. Since we have an odd number of students, I don’t want anyone to be working alone, so we would need to have 9 groups of 2 people and 1 group of 3 people . Every day they would change partners. For example, on day 1 and day 2, the groups would

问题 I want to create a combination of items from different categories ids. Can you help me? table +---------+-------------+------------+ | post_id | category_id | post_title | +---------+-------------+------------+ | 1 | 1 | Red | | 2 | 1 | Black | | 3 | 2 | Medium | | 4 | 3 | Male | | 5 | 3 | Female | +---------+-------------+------------+ The query results I want is as follows: Red-Medium-Male Black-Medium-Male Red-Medium-Female Black-Medium-Female For example, if there were items belonging to

问题 I'm trying to generate a DataFrame in Spark (but perhaps just Scala is enough) in which I have every combination of the last 24 months where the second year-month is always > the first year-month. For example, it is the 1 March 2019 as of writing this, I'm after something like: List( (2017, 3, 2017, 4), (2017, 3, 2017, 5), (2017, 3, 2017, 6), // .. (2017, 3, 2019, 3), (2017, 4, 2017, 5), // .. (2019, 1, 2019, 3), (2019, 2, 2019, 3), ) 回答1: This is easiest done with pure Scala without

问题 I am trying to create a function that takes a list as input and returns all possible selections of a particular number of elements from a list without using the inbuilt combination() function in itertools . For example, if we pass the list [1,2,3,4] and the number 3 to such a function, the function should return [[1,2,3],[1,2,4],[1,3,4],[2,3,4]] I have created a version of this function if the number of elements to be selected is 3 but I do not know how to deal with a generic number of nested