sorting

问题 I am developing backend project using node.js and going to implement sorting products functionality. I researched some articles and there were several articles saying bubble sort is not efficient. Bubble sort was used in my previous projects and I was surprised why it is bad. Could anyone explain about why it is inefficient? If you can explain by c programming or assembler commands it would be much appreciated. 回答1: Bubble Sort has O(N^2) time complexity so it's garbage for large arrays

问题 In C I have to write a bubble sort function that swaps the nodes and not the values of a LinkedList, but I'm unable to accomplish it. Here is the code (As you can see the order is not correct): #include <stdio.h> #include <malloc.h> // malloc, free #include <stddef.h> // NULL // defining 'int' as data_t typedef int data_t; typedef struct node_s { data_t data; struct node_s* next; } node_t; node_t** list_new() { node_t** list = malloc(sizeof **list); if (!list) return NULL; *list = NULL;

问题 In C I have to write a bubble sort function that swaps the nodes and not the values of a LinkedList, but I'm unable to accomplish it. Here is the code (As you can see the order is not correct): #include <stdio.h> #include <malloc.h> // malloc, free #include <stddef.h> // NULL // defining 'int' as data_t typedef int data_t; typedef struct node_s { data_t data; struct node_s* next; } node_t; node_t** list_new() { node_t** list = malloc(sizeof **list); if (!list) return NULL; *list = NULL;

问题 Basically i have an arraylist of objects like so: [{name: 'A'}, {name: 'B'}, {name:'?'}] I want to sort these so that the question mark is at the end like above. But using the below code. Collections.sort(myList); This always results in the object with the question mark first, I think this is due to ASCII ordering? I think the correct way forward is to use a comparator function but i'm not sure how that would take shape with letters and special characters? How would I implement this? 回答1: In

问题 Basically i have an arraylist of objects like so: [{name: 'A'}, {name: 'B'}, {name:'?'}] I want to sort these so that the question mark is at the end like above. But using the below code. Collections.sort(myList); This always results in the object with the question mark first, I think this is due to ASCII ordering? I think the correct way forward is to use a comparator function but i'm not sure how that would take shape with letters and special characters? How would I implement this? 回答1: In

问题 I need to implement a ranking algorithm for numeric vectors. I don't know if it's possible to do it using functions like rank(), order() or sort() in R, or if I should hard-code it. Either way, I could not do it. The algorithm works as follows: Let x = (x_1,x_2...,x_n) and y = (y_1,y_2,...y_n) be two vectors. We need to build the vector z composed of the ranked elements of x this way: If x_i < x_j then z_i < z_j If x_i = x_j then z_i < z_j if y_i < y_j z_i > z_j if y_i > y_j z_i = z_j if y_i

问题 MATLAB's sortrows function seems to leave ordering unchanged within each sorting group. Does anyone know whether this is actually true, as I cannot find any documentation supporting this. Using MATLAB's provided example for sortrows: A = {'Germany' 'Lukas'; 'USA' 'William'; 'USA' 'Andrew'; ... 'Germany' 'Andreas'; 'USA' 'Olivia'; 'Germany' 'Julia'} A = 'Germany' 'Lukas' 'USA' 'William' 'USA' 'Andrew' 'Germany' 'Andreas' 'USA' 'Olivia' 'Germany' 'Julia' and applying sortrows(A, [1]) ans =

问题 Can you please tell me if it is possible to have a 2D array with two day types. I am new to C#. For example: array[double][string] I have radius of flowers alone with their name as follows: 4.7,Iris-setosa 4.6,Iris-setosa 7,Iris-versicolor 6.4,Iris-versicolor 6.9,Iris-versicolor 5.5,Iris-versicolor 6.5,Iris-versicolor 6.3,Iris-virginica 5.8,Iris-virginica I would like to put these in to a 2D array and sort it according to the first double index. Please let me know if this is possible with an

问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . Improve this question I'd like an algorithm to put people into groups for an upcoming conference. There's lots of people going, from different regions, departments, genders etc, and they want to split people up as much as possible so get diversity in each group. So is there either a

问题 I have some Entrys in a python list.Each Entry has a creation date and creation time.The values are stored as python datetime.date and datetime.time (as two separate fields).I need to get the list of Entrys sorted sothat previously created Entry comes before the others. I know there is a list.sort() function that accepts a key function.In this case ,do I have to use the date and time to create a datetime and use that as key to sort() ? There is a datetime.datetime.combine(date,time) for this.