sorting

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.

问题 I have a sample class, say Country : class Country { public String name; public int population; public Flag flag; ... } I have this Flag class defined somewhere else class Flag { String id; int pixel; ... } Now I create a separate comparator DefaultFlagRankingComparator() that can sort Flag by id. How can I sort a list of Country by Flag id, using this DefaultFlagRankingComparator()? 回答1: You can invoke the compare method of the Comparator with the flag field of each country.

问题 In the following code, why do all three IntComparator() , IntComparator2 and IntComparator3 work as the 3rd parameter of the sort() function? Wouldn't they have different l-value function types? Based on https://en.cppreference.com/w/cpp/algorithm/sort it says The signature of the comparison function should be equivalent to the following: bool cmp(const Type1 &a, const Type2 &b); which seems to match IntComparator2 better? Also which one would be preferable? Third option seems much simpler

问题 What is the fastest way to sort an array of whole integers bigger than 0 and less than 100000 in Python? But not using the built in functions like sort. Im looking at the possibility to combine 2 sport functions depending on input size. 回答1: If you are interested in asymptotic time , then counting sort or radix sort provide good performance. However, if you are interested in wall clock time you will need to compare performance between different algorithms using your particular data sets , as

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 19 days ago . Improve this question I have an array of custom objects. The objects have a custom enum var 'type'. The different types are as follows: .movie .tv .trailer .genre .article I would like to sort the array by a pattern [movie, tv, trailer, genre, article, movie, tv, trailer, genre, article, ....etc] I

问题 This question already has answers here : Python (Numpy) array sorting (4 answers) Closed 5 years ago . Very new to Python so please bear with me here. I am trying to sort an array that I have imported into python with numpy.sort: guy = numpy.sort(sasBody, axis=-0) The first column is a column of strings, so I would like to alphabetically sort the array. The problem I am having is that it does sort the first column, however all the numbers associated with the prior rows are now not connected

问题 This question already has answers here : Python (Numpy) array sorting (4 answers) Closed 5 years ago . Very new to Python so please bear with me here. I am trying to sort an array that I have imported into python with numpy.sort: guy = numpy.sort(sasBody, axis=-0) The first column is a column of strings, so I would like to alphabetically sort the array. The problem I am having is that it does sort the first column, however all the numbers associated with the prior rows are now not connected

问题 I'm trying to sort long numbers in ASC but seems that the comparison is wrong. There is a sequence of correct digits, but from the 7th digit it all messes up. Can anyone advise why? The classes: public class MyTime { private long timeInMicroSeconds; public MyTime (long timeInMicroSeconds) { this.timeInMicroSeconds = timeInMicroSeconds; } } public class tester implements Comparator<MyTime> { public int compare(MyTime o1, MyTime o2) { return (int) ( (-1) * (o2.getTimeInMicroSeconds() - o1

问题 Basically I have a List<Map<String,Object>> , and I want to sort it by the values of certain key in the map. The problem is that I do not know the type... This map can contain Strings, Integers, Doubles, Floats etc.... I would like to sort it: So far List<Map<String,Object>> data = getResults(); Collections.sort(data, (o1, o2) -> (String.valueOf(o2.get("Field1"))) .compareTo((String.valueOf(o1.get("Field1"))))); It is not a great Idea since numbers are not properly sorted.... How can I handle