sorting

问题 I am planning to sort keys from a hashmap. I am using a customized sort method. Following code gives me compile-time error on compareTo() method where I am using Set as Collection Set<String> set = map.keySet(); Collections.sort(set, (a, b) -> map.get(a) == map.get(b) ? a.compareTo(b) : map.get(b) - map.get(a)); If I convert Set to List and then sort then everything works fine . List<String> words = new ArrayList<>(map.keySet()); Collections.sort(words, (a, b) -> map.get(a) == map.get(b) ? a

问题 I am trying to make a table with antd that allows sorting and row selection (using checkboxes). Right now I have both enabled, however, when I sort by ascending/descending order, the selection does not sort. The checked boxes just stay at the same index as before. To fix this I tried making a custom sort function that could possibly sort the selectedRowKeys the same way it is sorting the table rows, but I am not able to retrieve the information I need in the callback function to do this. Has

问题 I have a hash of arrays, and I need to sort it first on the keys, and then on the values in the array. Here's my simple code: my %myhash; $line1 = "col1 0.999"; $line2 = "col2 0.899"; $line3 = "col2 -0.52"; $line4 = "col2 1.52"; #insert into hash @cols = split(" ", $line1); push @{ $myhash{$cols[0]} }, $line1; @cols = split(" ", $line2); push @{ $myhash{$cols[0]} }, $line2; @cols = split(" ", $line3); push @{ $myhash{$cols[0]} }, $line3; @cols = split(" ", $line4); push @{ $myhash{$cols[0]} }

问题 I have one simple program below: import numpy as np arr = np.random.randn(8) new = arr.sort() new1 = np.sort(arr) print new print new1 I expected the two new arrays to be the same a sorted array, but instead, new is None , new1 is what I expected, what is the difference between two methods to sort? 回答1: From the documentation for numpy.ndarray.sort : Sort an array, in-place. If you want a sorted copy of the original array, rather than sorting in place, you should use numpy.sort , which

问题 I am trying to replace the following code: var R = Challenges.FindAll().SetSortOrder("UseCount").First(); var Q = Query.EQ("_id", R._id); var U = Update.Inc("UseCount", 1); Challenges.Update(Q, U); return R; Here's the intent: I have a field in a DB called 'UseCount' and I want to find the record with the lower value. If many records have the same value, I just want the first (it's not important). I want, at the same time, to increment the 'UseCount' field by one. I have seen examples of

问题 So I got 4 rectangular shapes and I'm trying to apply a sorting algorithm (painters algorithm) to know which shapes (in 3d) I need to draw first and which one after. Note : The camera is in the bottom right corner: The correct order would be: purple, red, blue, green (for drawing of course reversed order). So I've implemented an algorithm which creates something like this: Theres every object listed with it's correct successors and predecessors . ITEM: red predecessor: - successor: - ITEM:

问题 I'm using jQuery DataTables to display information from JSON encoded PHP response. The JSON response contains the object "name". "name" contains "Full Name", "Last Name", "ID". I have been using columns to display the data the way I want but, I've ran into a problem I can't figure out. In the code below example 1 works fine and will display "Full Name" while sorting by "Last Name". However, example 2 is not working at all. The desired output would contain HTML rendered display and sorted by

问题 A good solution to sorting k-sorted arrays(each element is at most k away from its target position) is, 1) Create a Min Heap of size k+1 with first k+1 elements. This will take O(k) time. 2) One by one remove min element from heap, put it in result array, and add a new element to heap from remaining elements. overall complexity will be O(k) + O((n-k)*logK) I can't understand the relevance of the array being k-sorted to using the heap technique. Won't this work even when the array is not k

问题 A good solution to sorting k-sorted arrays(each element is at most k away from its target position) is, 1) Create a Min Heap of size k+1 with first k+1 elements. This will take O(k) time. 2) One by one remove min element from heap, put it in result array, and add a new element to heap from remaining elements. overall complexity will be O(k) + O((n-k)*logK) I can't understand the relevance of the array being k-sorted to using the heap technique. Won't this work even when the array is not k

问题 Is there a difference between default sort order for a select query in SQL Server 2005 and SQL Server 2012? I have a table variable without a primary key. When I execute a select query on the table variable in SQL Server 2005, the records are selected and displayed in alphabetical order as per one of the columns. In SQL Server 2012, the records are displayed in the same order as in the parent table. 回答1: There is no default sort order. Unless you specify it in the ORDER BY clause, there is no