algorithm

问题 I'm writing an article on the n-body problem, and I'd like to be technically accurate. The code is here. And here are the comments and loops: /** * Given N bodies with mass, in a 3d space, calculate the forces of gravity to be applied to each body. * * This function is exported to JavaScript, so only takes/returns numbers and arrays. * For N bodies, pass and array of 4N values (x,y,z,mass) and expect a 3N array of forces (x,y,z) * Those forcess can be applied to the bodies mass to update the

问题 I'm trying to find and return the single even integer in a list of odd integers or the sole odd integer in a list of even integers. My code works, however, if the length of the list for odd integers is even, it returns the first number in the list instead of the even integer. Any help is appreciated. Code below: even = [2, 4, 6, 8, 10, 12, 14, 2091] #2091 is the outlier and len(x) = 8 odd = [1, 3, 5, 7, 9, 11, 13, 4720] #4720 is the outlier and len(x) = 8 def find_outlier(x): # Determine if

问题 I am trying to build a 6-tuple store on top of wiredtiger. The tuples can be described as follow: (graph, subject, predicate, object, alive, transaction) Every tuple stored in the database is unique. Queries are like regular SPARQL queries except that the database store 6 tuples. Zero of more elements of a tuple can be variable. Here is an example query that allows to retrieve all changes introduces by a particular transaction P4X432 : SELECT ?graph ?subject ?predicate ?object ?alive WHERE {

问题 how adjacency list and adjacency matrix are able to logically present a non-linear data structure, even though they are themselves linear. Someone Pls explain 回答1: Stacks, queues, lists, vectors/arrays: they all store data linearly in the sense that items are stored one after the other. There is the notion of "item A comes before item B", and "item C comes after item B". One before, one after. They only differ in how items can be accessed (FIFO, LIFO, by rank, by position). Trees (a type of

问题 I have an ABAP class which encodes a string as qr code and sends this code as email. At a later point, the code will be decoded by a SAPUI5 app based on JavaScript. I don't want that everyone can decode the string behind that qr code with some basic barcode scanner app. That's why I'm looking for some ideas for encrypting the string in ABAP and decrypting it with JavaScript. Maybe also with a simple algorithm? It's just that the string should not give usable information to someone who decodes

问题 how adjacency list and adjacency matrix are able to logically present a non-linear data structure, even though they are themselves linear. Someone Pls explain 回答1: Stacks, queues, lists, vectors/arrays: they all store data linearly in the sense that items are stored one after the other. There is the notion of "item A comes before item B", and "item C comes after item B". One before, one after. They only differ in how items can be accessed (FIFO, LIFO, by rank, by position). Trees (a type of

问题 I have an ABAP class which encodes a string as qr code and sends this code as email. At a later point, the code will be decoded by a SAPUI5 app based on JavaScript. I don't want that everyone can decode the string behind that qr code with some basic barcode scanner app. That's why I'm looking for some ideas for encrypting the string in ABAP and decrypting it with JavaScript. Maybe also with a simple algorithm? It's just that the string should not give usable information to someone who decodes

问题 You are given an array containing N integers and you have to answer K queries. Each query contains an integer X which is the index of the (1 based index) element of the array. Calculate the following for each query: The number of segments containing the index X as the leftmost or the rightmost element and the number at the index `X` is `>=` each element of that segment. Segment formation example: You have array {1, 2, 3} . The possible segments for 3 are [2,3] and [1,2,3] and [3] . The

问题 I have been trying to solve this problem in an efficient way. The problem is: Problem Statement Given a list of tuples in the form [(start1, end1), (start2, end2), (start3, end3)....(startn, endn)] where start and end are positive integers. Each tuple is to represent a time window, for example: [(1, 3), (73, 80)...] . Find the time (integer) where max concurrency occurs and get the tuples where max concurrency occurs. Constraints: start and end are integers of time and are between 0 to n For

问题 I have been trying to solve this problem in an efficient way. The problem is: Problem Statement Given a list of tuples in the form [(start1, end1), (start2, end2), (start3, end3)....(startn, endn)] where start and end are positive integers. Each tuple is to represent a time window, for example: [(1, 3), (73, 80)...] . Find the time (integer) where max concurrency occurs and get the tuples where max concurrency occurs. Constraints: start and end are integers of time and are between 0 to n For