recursion

问题 I am trying to make a custom component that call itself. i keep getting an error Unknown custom element: <TestRec> - did you register the component correctly? For recursive components, make sure to provide the "name" option. I have included a name option as you can see below but this doesn't solve the problem. Any idea what it could be? <template> <div> <h4>I am a component that can call itself below</h4> <v-select :items="['TestRec', 'normal']" v-model="comp"></v-select> <hr /> <component

问题 I have a model with a self referential field called parent. Model: class Zone(BaseModel): name = models.CharField(max_length=200) parent = models.ForeignKey('self', models.CASCADE, blank=True, null=True, related_name='children') def __unicode__(self): return self.name Serializer: class ZoneSerializer(ModelSerializer): parent = PrimaryKeyRelatedField(many=False, queryset=Zone.objects.all()) parent_disp = StringRelatedField(many=False, source="parent") class Meta: model = Zone fields = ('id',

问题 I have problem understanding this code: #include <iostream> using namespace std; void Print_numm(int numm){ cout<<numm; if (numm<=4) { Print_numm(numm+1); } cout<<numm; } int main() { Print_numm(1); return 0; } The output is 1234554321. I understand the recursion up until it prints 123455. But why the compiler prints the rest of of numbers down to 1? Does the compiler do the second "cout" every time? And if so how it keeps the numbers until they are printed up to 5 and then prints the rest

问题 I am working on a function which should recursively parse through the data structure passed into it and then print it out with indentation. Something like: indent(foo=>{bar=>'baz'}) should print like: foo bar : baz indent(foo=>[a,b,c=>'d',e]) should print like foo a b c:d e I came across a post here on Stack Overflow with a very similar scenario using depth-first recursion, as well as this page about how to recurse through a Perl data structure. However, I am unable to follow how the the

问题 A script was needed to quickly tell me how many html comments there are on the page and what their contents are. Using an anonymous function for recursive DOM traversal seemed appropriate: var comments = []; //set up an array where comment contents will be copied to (function(D) { if (8===D.nodeType) comments.push(D.nodeValue); //check if node is a comment D=D.firstChild; while (D) { arguments.callee(D); //recursively look for comments... D=D.nextSibling; //...and remember to iterate over all

问题 I'm using Node v8.10.0 Node.js tail-call optimization: possible or not? The above question explains how Node.js doesn't support TCO anymore. I recently experienced an issue with a function like this though: async function processBatch(nthBatch) { // do a bunch of async work and build up variables await processBatch(nthBatch + 1); } The code had a memory leak which was immediately fixed by changing this to: async function processBatch(nthBatch) { // do a bunch of async work and build up

问题 I am trying to build a function that takes in a list and returns a tuple of (min, max). For example, [2,1,4,9,4.5] would return (1, 9) I am trying to use only recursion and want to perform this task without using other things that would make this very easy (such as min(),max(),sort(),sorted(),loop..etc) So far, I have been able to create function that find maximum def findmax(alist): if len(alist) <= 1: return tuple(alist) elif len(alist) == 2: if alist[0] >= alist[1]: return findmax([alist[0

问题 I'm struggling on how to increment a basic counter in javascript. What do I want to achieve ? I need a counter inside a foreach loop. The goal is to be able to count each time the //Write smthg is triggered. Below is the updated version of the code I'm using. For the moment, it returns weird sequences of numbers. I guess it is resetted each time the recursive loop is triggered. I do not know how to correct it, suppose it's a basic javascript problem but as I'm learning through experimenting

问题 I'm currently studying my second programming course in java and have a problem with an assignment that I need to complete to pass the course. Basically it's about writing a program that recursively solves sudoku with backtracking. This is the algorithm I came up with. I used a 9x9 array to represent the grid which in the beginning is filled with zeroes. checkFill checks whether it's possible to insert a number (var) into a position[i][j]. The problem is that it only solves sudoku partially it

问题 I'm currently studying my second programming course in java and have a problem with an assignment that I need to complete to pass the course. Basically it's about writing a program that recursively solves sudoku with backtracking. This is the algorithm I came up with. I used a 9x9 array to represent the grid which in the beginning is filled with zeroes. checkFill checks whether it's possible to insert a number (var) into a position[i][j]. The problem is that it only solves sudoku partially it