sorting

问题 I've found a few answers to sorting by value, but not key. What I'd like to do is a reverse sort, so with: $nametocode['reallylongname']='12'; $nametocode['shortname']='10'; $nametocode['mediumname']='11'; I'd like them to be in this order reallylongname mediumname shortname mediumname shortname Many thanks 回答1: Another solution using array_multisort: $keys = array_map('strlen', array_keys($arr)); array_multisort($keys, SORT_DESC, $arr); Here $keys is an array of the lengths of the keys of

问题 I'm not C expert and I've read through the forum, but I still need some advice regarding a sorting problem on C. I have 4 dynamic arrays of doubles in C. All of them are the same size, and lets say n. What I want to do is to sort all of them using one of the arrays as first order and a second array as my second order. So if the arrays are *x, *y, *w and *z. I want to sort them according to the values of *x, then *y. I must do this efficiently because the arrays are quite large. Any help will

问题 I'm not C expert and I've read through the forum, but I still need some advice regarding a sorting problem on C. I have 4 dynamic arrays of doubles in C. All of them are the same size, and lets say n. What I want to do is to sort all of them using one of the arrays as first order and a second array as my second order. So if the arrays are *x, *y, *w and *z. I want to sort them according to the values of *x, then *y. I must do this efficiently because the arrays are quite large. Any help will

问题 This question already has answers here : Ordering of elements in Java HashSet (2 answers) Closed 5 years ago . this is my code on one exercise, public class RockTest { public static void main(String[] args){ HashSet<Rock> hashset = new HashSet(); Rock rock1 = new Rock("QingDanasty",89); Rock rock2 = new Rock("Modern",32); Rock rock3 = new Rock("MingDanasty",100); hashset.add(rock1); hashset.add(rock2); hashset.add(rock3); Iterator<Rock> iterator = hashset.iterator(); while(iterator.hasNext())

问题 This question already has answers here : Ordering of elements in Java HashSet (2 answers) Closed 5 years ago . this is my code on one exercise, public class RockTest { public static void main(String[] args){ HashSet<Rock> hashset = new HashSet(); Rock rock1 = new Rock("QingDanasty",89); Rock rock2 = new Rock("Modern",32); Rock rock3 = new Rock("MingDanasty",100); hashset.add(rock1); hashset.add(rock2); hashset.add(rock3); Iterator<Rock> iterator = hashset.iterator(); while(iterator.hasNext())

问题 This question already has answers here : Ordering of elements in Java HashSet (2 answers) Closed 5 years ago . this is my code on one exercise, public class RockTest { public static void main(String[] args){ HashSet<Rock> hashset = new HashSet(); Rock rock1 = new Rock("QingDanasty",89); Rock rock2 = new Rock("Modern",32); Rock rock3 = new Rock("MingDanasty",100); hashset.add(rock1); hashset.add(rock2); hashset.add(rock3); Iterator<Rock> iterator = hashset.iterator(); while(iterator.hasNext())

问题 I'm using the following PHP code to list all files and folders under the current directory: <?php $dirname = "."; $dir = opendir($dirname); while(false != ($file = readdir($dir))) { if(($file != ".") and ($file != "..") and ($file != "index.php")) { echo("<a href='$file'>$file</a> <br />"); } } ?> The problem is list is not ordered alphabetically (perhaps it's sorted by creation date? I'm not sure). How can I make sure it's sorted alphabetically ? 回答1: The manual clearly says that: readdir

问题 I have nested arrays within an object, and I need to extract these values, and sort them into alphabetical order which will then be displayed in a table. I am using the localeCompare method but it is returning: Cannot read property 'localeCompare' of null To be honest, I am not sure I am approaching this correctly. Using sort you can compare a to b to sort them into alphabetical order. I am getting confused how to compare the values from the arrays within a and b . I am using the first sort

问题 How can i put a list of strings, type string in String countryList[] = {a}; a is the variable that have the list so, it will be String countryList[] = {"heyyesGabon","heyyesGibraltar","heyyesGuinea"}; //and the others this list comes from console.log in javascript it always save the last item 回答1: From List to String array String [] countryArray = countryList.toArray(new String[0]); From String array to List List<String> list = Arrays.asList(array); 回答2: You can use in-build function list

问题 I successful implemented sorting and drag & drop, but there fun begins. I need both of them in one list. At this moment it working like ... i can sort (it's ok), i can drag (it's ok) but i can't drop, every time it going back to first position. <table cdkDropList matSort (cdkDropListDropped)="drop($event)" (matSortChange)="sortData($event)"> <tr> <th mat-sort-header="name">Name</th> </tr> <tr *ngFor="let element of sortedData" cdkDrag> <td>{{element.name}}</td> </tr> </table> This is a part