sorting

问题 A sequential unique list of numbers (1,2,3,...,n) has been randomized and I need to sort it by moving one item at a time to the end of the list. Which algorithm will provide the least number of moves? Note: [123645] can be sorted with 1 move, [125346] in 2 moves, [654321] will need 5 moves. I'd like an algorithm that can account for these, not one that just gives me n-1 all the time. Best I can think of: for(var x=1; x<=list.length; x++) if indexOf(x+1)<indexOf(x) then move x+1 to end Does

问题 A sequential unique list of numbers (1,2,3,...,n) has been randomized and I need to sort it by moving one item at a time to the end of the list. Which algorithm will provide the least number of moves? Note: [123645] can be sorted with 1 move, [125346] in 2 moves, [654321] will need 5 moves. I'd like an algorithm that can account for these, not one that just gives me n-1 all the time. Best I can think of: for(var x=1; x<=list.length; x++) if indexOf(x+1)<indexOf(x) then move x+1 to end Does

问题 I am working on a bonus question for a course I am taking. Suppose we have a list such as mylist=[a1, b2, a3, c1, b1, a5, b3, c9] . I want to use basic Python without importing anything. I want to sort the list into, first, alphabetical order, and then for each letter, I sort by number. The result would thus be be the list [a1, a3, a5, b1, b2, b3, c1, c9]. I am implementing a simple bubble sort for the numbers, but how do I sub-sort the letters (or, perhaps, vice versa?) 回答1: Use sorted or

问题 I am working on a bonus question for a course I am taking. Suppose we have a list such as mylist=[a1, b2, a3, c1, b1, a5, b3, c9] . I want to use basic Python without importing anything. I want to sort the list into, first, alphabetical order, and then for each letter, I sort by number. The result would thus be be the list [a1, a3, a5, b1, b2, b3, c1, c9]. I am implementing a simple bubble sort for the numbers, but how do I sub-sort the letters (or, perhaps, vice versa?) 回答1: Use sorted or

问题 I have this code : widget.items.sort((a, b) { await getItemDistance(a, true); await getItemDistance(b, false); return (itemADistance) .compareTo(itemBDistance); }); I am trying to sort widget.items list based on values returned from getItemDistance. However I get an error with a red squiggly line that says : The await expression can only be used in an async function and when I try to add async to the sort method I get another red squiggly line that says : The argument type 'Future Function

问题 I want to create a single array of posts by merging the results of 2 separate get_posts queries, and have the array ordered by published date. In my code below, the get_posts for $args_b and $args_a have been merged into one array, but they are separated: The 9 titles of $args_b are listed first and then the 9 titles of $args_a . I want them to be mixed, and ordered by date. How do I sort them? <?php $args_a = array( 'posts_per_page' => 9, 'category_name' => 'shinmatsudo', 'category__in' =>

问题 I am trying to sort a list of list items in Python by the frequency of the occurrence The unsorted list looks something like this : a=[ ['item1', 'item2', 'element2'], ['item3', 'item4', 'element3'], ['item5', 'item6', 'element1'], ['item7', 'item8', 'element3']] I would like to sort by the frequency of the 3rd element of the list. So, the result list after sorting, would look something this : result = [ ['item3', 'item4', 'element3'], ['item7', 'item8', 'element3'], ['item1', 'item2',

问题 I'm wondering how Excel would sort identical values. I have ID numbers, but there are instances where there would be a duplicate ID number. I'm unsure about how Excel would decide how to order these? Would it just look at the information in the adjacent row and then compare those values as part or the ordering? If I had: Column A | Column B 166 C 166 A 166 B And then sorted on Column A in descending order, would I get: Column A | Column B 166 C 166 A 166 B Or would I get: Column A | Column B

问题 I have made a class as follows: class strVal{ double val; String str; } Now I made an array of this class now I want to sort that array by strVal.val . I want to know if there is any standard defined method in Java? 回答1: Implement java.lang.Comparable interface, and use java.util.Arrays.sort(...) to sort an array of StrVal: public class StrVal implements Comparable<StrVal> { private double val; private String str; public StrVal(double val, String str) { this.val = val; this.str = str; }

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