nested | 易学教程

C++ N nested vectors at runtime

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问题 In C++ (with or without boost), how can I create an N dimensional vectors where N is determined at runtime? Something along the lines of: PROCEDURE buildNVectors(int n) std::vector < n dimensional std::vector > *structure = new std::vector< n dimensional std::vector >() END If passed 1, a vector would be allocated. If passed 2, a 2d nested matrix would be allocated. If passed 3, a 3d cube is allocated. etc. 回答1: Unfortunately you will not be able to do this. A std::vector is a template type

Determining as a function of n how often the statement incrementing the variable count is performed

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问题 Ok so I'm new to analyzing algorithms and would really appreciate any helpful tips that can be shared on how to go about this. I am trying to determine how many times count is incremented as a function of n. I have ran it in an ide and for values 1-7 the output is 1,3,6,10,15,21,28. Im just unsure how to write this as a function of n? Thanks. The loop is as follows: for(int i = 1 ; i <= n ; i++){ for (int j = 1 ; j <= i ; j++) { count++; } } 回答1: The aim of this type of exercise is to teach

Nested Templates, Finding Parent

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问题 I have a series of nested objects. Say like... stores and items. I have perhaps 10 stores, each with the same 10 items, displayed on the screen at the same time. <template name='store'> {{#each items}} {{> item}} {{/each}} </template> <template name='item'> {{name}} {{qty}} </template> The main problem I have is trying to determine {{qty}} using a helper function. This is because the item inherently does not have a 'quantity', but rather it depends on which "store" it is related to. So I'd

Using MongoDB's positional operator $ in a deeply nested document query

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问题 Is it possible to use positional operator '$' in combination with a query on a deeply-nested document array? Consider the following nested document defining a 'user': { username: 'test', kingdoms: [ { buildings: [ { type: 'castle' }, { type: 'treasury' }, ... ] }, ... ] } We'd like to return the 'castles' for a particular user e.g. in a form: { kingdoms: [{ buildings: [{ type: 'castle' }] }] } Because you cannot use the $ operator twice (https://jira.mongodb.org/browse/server-831) I know that

Logic for displaying infinite category tree in nested <ul>s from Self Join Table

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问题 Please help me solve my big problem. in my on-line shopping project i created a dynamic Category List (with Infinite Level Depth) Implemented in a Single Table in DB with Self join. the schema is like below: (source: aspalliance.com) Update I want to use a JQuery plugin to make a Multi Level Menu bar. this plugin uses <ul> and <li> elements so I should transform the DB table to <ul> and <li> . the result should like this: <ul> <li>Clothing 1 <ul> <li>Trousers 2 <ul> <li>Mens trousers 3</li>

Sort nested object in Elasticsearch

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问题 I'm using the following mapping: PUT /my_index { "mappings": { "blogpost": { "properties": { "title": {"type": "string"} "comments": { "type": "nested", "properties": { "comment": { "type": "string" }, "date": { "type": "date" } } } } } } } Example of document: PUT /my_index/blogpost/1 { "title": "Nest eggs", "comments": [ { "comment": "Great article", "date": "2014-09-01" }, { "comment": "More like this please", "date": "2014-10-22" }, { "comment": "Visit my website", "date": "2014-07-02" },

Does an equivalent of override exist for nested functions?

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问题 If I have this function, what should I do to replace the inner function with my own custom version? def foo(): def bar(): # I want to change this pass # here starts a long list of functions I want to keep unchanged def baz(): pass Using classes this would be easily done overriding the method. Though, I can't figure out how to do that with nested functions. Changing foo to be a class (or anything else) is not an option because it comes from a given imported module I can't modify. 回答1: Here's

Preferred way to include relative reference to JavaScript in VS 2008 nested Masterpage

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问题 Our base Masterpage has something like the following <head runat="server"> <title></title> <script type="text/javascript" src="<%= Page.ResolveClientURL("~/javascript/actions.js")%>"></script> <script type="text/javascript" src="<%= Page.ResolveClientURL("~/javascript/jquery/jquery-1.2.6.min.js")%>"></script> <asp:contentplaceholder id="cph_htmlhead" runat="server"> </asp:contentplaceholder> </head> If this Masterpage is the Masterpage for an ASPX page things work fine. If this Masterpage is

Preferred way to include relative reference to JavaScript in VS 2008 nested Masterpage

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Print complete key path for all the values of a python nested dictionary

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问题 If below is my nested dictionary I want to parse through recursively and print all the values along with the complete path of the nested key. my_dict = {'attr':{'types':{'tag':{'name':'Tom', 'gender':'male'},'category':'employee'}}} Expected output: Key structure : my_dict["attr"]["types"]["tag"]["name"]<br> value : "Tom"<br> Key structure : my_dict["attr"]["types"]["tag"]["gender"]<br> value : "male"<br> Key structure : my_dict["attr"]["types"]["category"]<br> value : "employee"<br> I wrote