sorting

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question When I print the values in the sorted method, Stream.of("d", "a", "b", "e", "c", "f") .sorted((s1, s2) -> { System.out.printf("sort: %s - %s\n", s1, s2); return s1.compareTo(s2); }).forEach(System.out::println); The output is as follows; sort: a - d sort: b - a sort: b - d sort:

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question When I print the values in the sorted method, Stream.of("d", "a", "b", "e", "c", "f") .sorted((s1, s2) -> { System.out.printf("sort: %s - %s\n", s1, s2); return s1.compareTo(s2); }).forEach(System.out::println); The output is as follows; sort: a - d sort: b - a sort: b - d sort:

问题 I don't know why I got stuck in a problem that the chatList is not sorting by the last message time or by the most recent message. I have tried storing timestamp in the database and orderChildBy timestamp but it still not working. not working means the list get not sort after every message and keep showing the list as the sorted after first message. Look at the image how chats are disordered! This is the way I created chatList in the firebaseDatabase in ChatActiviy on sendMessage: val timeAgo

问题 I don't know why I got stuck in a problem that the chatList is not sorting by the last message time or by the most recent message. I have tried storing timestamp in the database and orderChildBy timestamp but it still not working. not working means the list get not sort after every message and keep showing the list as the sorted after first message. Look at the image how chats are disordered! This is the way I created chatList in the firebaseDatabase in ChatActiviy on sendMessage: val timeAgo

问题 I have to sort an array of strings like this: var arr = ["akaw","waka","kawa","akwa"]; The type of sort must be by a specific letter, W in this case so my function must return this array: arr = ["waka","kawa","akwa","akaw"]; It's a dynamic array and I don't know the number of words in array and if each words have no letter W, one W or some W. Do you know a type of sort function to do that? Thx! 回答1: Just compare the index of the letter. arr.sort(function(a,b) { return a.indexOf("w") - b

问题 I am attempting to sort a NumPy array by frequency of elements. So for example, if there's an array [3,4,5,1,2,4,1,1,2,4], the output would be another NumPy sorted from most common to least common elements (no duplicates). So the solution would be [4,1,2,3,5]. If two elements have the same number of occurrences, the element that appears first is placed first in the output. I have tried doing this, but I can't seem to get a functional answer. Here is my code so far: temp1 = problems[j] indexes

问题 I am attempting to sort a NumPy array by frequency of elements. So for example, if there's an array [3,4,5,1,2,4,1,1,2,4], the output would be another NumPy sorted from most common to least common elements (no duplicates). So the solution would be [4,1,2,3,5]. If two elements have the same number of occurrences, the element that appears first is placed first in the output. I have tried doing this, but I can't seem to get a functional answer. Here is my code so far: temp1 = problems[j] indexes

问题 I measured a sorting program / algorithm and based on the runtime data, I have narrowed it down to two sorting algorithms - bubble sort and insertion sort. Is there a way to know for sure which one it is? Without knowing the code of course. They both have the same time complexity and I'm out of ideas. Time complexity data: Sorted: O(n) Time taken for 1000 numbers = 0.0047s Random unsorted: O(n^2) Time taken for 1000 numbers = 0.021s Descending order: O(n^2) Time taken for 1000 numbers = 0.04s

问题 I measured a sorting program / algorithm and based on the runtime data, I have narrowed it down to two sorting algorithms - bubble sort and insertion sort. Is there a way to know for sure which one it is? Without knowing the code of course. They both have the same time complexity and I'm out of ideas. Time complexity data: Sorted: O(n) Time taken for 1000 numbers = 0.0047s Random unsorted: O(n^2) Time taken for 1000 numbers = 0.021s Descending order: O(n^2) Time taken for 1000 numbers = 0.04s

问题 In attempt to learn python by practicing, I am trying to implement and test out quick sort algorithm using python. The implementation itself was not difficult, however the result of the sort is somewhat puzzling: When I sort a list ['35', '-1', '-2', '-7', '-8', '-3', '-4', '20', '-6', '53'] the result gives me ['-1', '-2', '-3', '-4', '-6', '-7', '-8', '20', '35', '53'] So the list is sorted however the negative integers are sorted in reverse order. I suspect this may be the problem with the