comparison

问题 This question already has answers here : Check whether an array is a subset of another (8 answers) Closed 6 years ago . I have two lists as follows var query1 = from enrollments in db.Enrollments where enrollments.studentID == studentID && enrollments.result >= 50 && enrollments.enrolled == false select enrollments.subjectID; var query2 = from prerequisites in db.Prerequisites where prerequisites.subjectID == subjectID select prerequisites.prerequisiteID; Now I want to make sure that all the

问题 I have this quiz application where I match what people type with the right answer. For now, what I do is basically that : if ($input =~ /$answer/i) { print "you won"; } It's nice, as if the answer is "fish" the user can type "a fish" and be counted a good answer. The problem I'm facing is that, well, my users as I are french, and I'd like to be able to accept, say, a user typing "taton", and the answer being "tâton". So, what I could do, is : use POSIX qw(locale_h); use locale; setlocale(LC

问题 I have this quiz application where I match what people type with the right answer. For now, what I do is basically that : if ($input =~ /$answer/i) { print "you won"; } It's nice, as if the answer is "fish" the user can type "a fish" and be counted a good answer. The problem I'm facing is that, well, my users as I are french, and I'd like to be able to accept, say, a user typing "taton", and the answer being "tâton". So, what I could do, is : use POSIX qw(locale_h); use locale; setlocale(LC

问题 I have got 2 files. Let us call them md5s1.txt and md5s2.txt. Both contain the output of a find -type f -print0 | xargs -0 md5sum | sort > md5s.txt command in different directories. Many files were renamed, but the content stayed the same. Hence, they should have the same md5sum. I want to generate a diff like diff md5s1.txt md5s2.txt but it should compare only the first 32 characters of each line, i.e. only the md5sum, not the filename. Lines with equal md5sum should be considered equal. The

问题 In Java, I use a class in which some fields can be null . For example: class Foo { String bar; //.... } I want to write a BarComparator for this class, private static class BarComparator implements Comparator<Foo> { public int compare( final Foo o1, final Foo o2 ) { // Implementation goes here } } Is there a standard way to deal with the fact that any of o1 , o2 , o1.bar , o2.bar can be null , without writing lots of nested if ... else ? Cheers! 回答1: I guess you could wrap the call to the

问题 In Java, I use a class in which some fields can be null . For example: class Foo { String bar; //.... } I want to write a BarComparator for this class, private static class BarComparator implements Comparator<Foo> { public int compare( final Foo o1, final Foo o2 ) { // Implementation goes here } } Is there a standard way to deal with the fact that any of o1 , o2 , o1.bar , o2.bar can be null , without writing lots of nested if ... else ? Cheers! 回答1: I guess you could wrap the call to the

问题 I have two images the same size. What is the best way to find the rectangle in which they differ. Obviously I could go through the image 4 times in different directions, but i'm wondering if there's an easier way. Example: 回答1: I don't think there is an easier way. In fact doing this will just be a (very) few lines of code, so unless you find a library that does that for you directly you won't find a shorter way. 回答2: A naive approach would be to start at the origin, and work line by line,

问题 here's a very basic question, that I'm sure you will be able to answer quickly. Please don't laugh at my ignorance. I have a string, that I want to compare to an array of strings. Only if the string is not part of the array, I want to perform an operation. I tried the following code, that doesn't work. I do understand why, but I just can't think of a way to do it correctly. Please help me out of my misery. Thanks in advance Sjakelien -(void) findRedundant: (NSString *) aString { #define ALPHA

问题 In a unit test, I want to verify that two lists contain the same elements. The list to test is build of a list of Person objects, where one field of type String is extracted. The other list contains String literals. One often finds the following code snippet to accomplish this task (see this answer): List<Person> people = getPeopleFromDatabasePseudoMethod(); List<String> expectedValues = Arrays.asList("john", "joe", "bill"); assertTrue(people.stream().map(person -> person.getName()).collect

问题 In a unit test, I want to verify that two lists contain the same elements. The list to test is build of a list of Person objects, where one field of type String is extracted. The other list contains String literals. One often finds the following code snippet to accomplish this task (see this answer): List<Person> people = getPeopleFromDatabasePseudoMethod(); List<String> expectedValues = Arrays.asList("john", "joe", "bill"); assertTrue(people.stream().map(person -> person.getName()).collect