traversal | 易学教程

Iterative DFS vs Recursive DFS and different elements order

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问题 I have written a recursive DFS algorithm to traverse a graph: void Graph<E, N>::DFS(Node n) { std::cout << ReadNode(n) << \" \"; MarkVisited(n); NodeList adjnodes = Adjacent(n); NodeList::position pos = adjnodes.FirstPosition(); while(!adjnodes.End(pos)) { Node adj = adjnodes.ReadList(pos); if(!IsMarked(adj)) DFS(adj); pos = adjnodes.NextPosition(pos); } } Then I have written an iterative DFS algorithm using a stack: template <typename E, typename N> void Graph<E, N>::IterativeDFS(Node n) {

List directory tree structure in python?

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问题 I know that we can use os.walk() to list all sub-directories or all files in a directory. However, I would like to list the full directory tree content: - Subdirectory 1: - file11 - file12 - Sub-sub-directory 11: - file111 - file112 - Subdirectory 2: - file21 - sub-sub-directory 21 - sub-sub-directory 22 - sub-sub-sub-directory 221 - file 2211 How to best achieve this in Python? 回答1: Here's a function to do that with formatting: import os def list_files(startpath): for root, dirs, files in os

How to select all content between two tags in jQuery

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问题 I have a document with headings and unordered lists. How can I use JQuery to select a given heading (by its unique class name) AND all content between that heading and the next heading? Update: Your suggestions are great, but aren\'t what I\'m looking for. In the below code, for example, I would like to access only the \"h1\" with id of \"heading2\" and everything up to, but not including the \"h1\" with id of \"heading3\". The jQuery examples provided above will access everyting after the

Find all occurrences of a key in nested python dictionaries and lists

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I have a dictionary like this: { "id" : "abcde", "key1" : "blah", "key2" : "blah blah", "nestedlist" : [ { "id" : "qwerty", "nestednestedlist" : [ { "id" : "xyz", "keyA" : "blah blah blah" }, { "id" : "fghi", "keyZ" : "blah blah blah" }], "anothernestednestedlist" : [ { "id" : "asdf", "keyQ" : "blah blah" }, { "id" : "yuiop", "keyW" : "blah" }] } ] } Basically a dictionary with nested lists, dictionaries and strings, of arbitrary depth. What is the best way of traversing this to extract the values of every "id" key? I want to achieve the equivalent of an XPath query like "//id". The value of