## Find the maximum depth of a binary tree

public class TreeNode { int val; TreeNode left; TreeNode right; TreeNode(int x) { val = x; } } public class Solution { public int maxDepth(TreeNode root) { TreeNode focusNode = root; TreeNode focusNode2 = root; int count = 0; int count1 = 0; boolean

## Calculating descendants in a tree

I've created a structure to represent a simple tree like this: A / \ B C / \ / \ D E F G Each node is a Record which is my custom class with some fields inside. In the following example is simplified with just the field that contains the node's child

## Counting with recursion in binary trees confuse me

I am trying to learn as much as i can about tree's and their algorithm's. And it seems like i can't really learn how recursion works when i want to count something in binary tree. For example if i want to count nodes or leaves or something else. When

## Modeling an arbitrary tree in C ++ (with iterators)

I am looking for a way to model a tree with an arbitrary amount of childrens per nodes. This answer suggests using the Boost Graph Library for this task: What's a good and stable C++ tree implementation? The main operations that I need to perform are

## How to learn to learn (Tree) on several attributes?

I am using python and scikit-learn's tree classifier in a little fictive machine learning problem. I have binary outcome variable (wc_measure) and I believe it is dependent on a few other variables (cash, crisis, and industry). I tried the following:

## C: Finding the Huffman-encoded path of a specific leaf in a tree

I'm trying to write a recursive function that locates a specific leaf within a Huffman tree, then prints its shortest path with zeros and ones (zero being a traversal to the left, and one being a traversal to the right). I understand the logic of wha

## How to search and check all the dynamic boxes of the child in the tree using jquery?

I have added check-boxes dynamically to all the element and successfully added the functionality to select all checkboxes but not able to do the selection for the parent child checkboxes in tree structure means if i select the "Asia" it should s

## Give unique IDs to all nodes?

I am making a class in Python that relates a lot of nodes and edges together. I also have other operations that can take two separate objects and merge them into a single object of the same type, and so on. However, I need a way to give every node a

## How to apply SQL LIMIT for three structure data?

I use a famous method for showing the three comment from SQL. How I can display only first three root comment with a all sub-comment? I tried to make something like: SELECT * FROM NAMES ORDER BY pid LIMIT 3 ASC, Id ASC LIMIT 3 But LIMIT is not suppor

## Recursive deletion of tree elements in python

seen2 = set() def eliminate_abs(d): ##remove all entries that connect to the abstraction node, type(d) = list def rec(x): if x not in seen2: seen2.add(x) a = x.hypernyms() if len(a) != 0: kk = a if re.search('abstraction',str(kk)): syns.remove(ii)

## Make physical links from all subfolders to all subfolders of Linux?

I have two folders, let's call them A and B. Both folders have a folder structure under them, that is identical. Say A has folders 1, 2, 3, 4 and 5. B has folders 1, 2, 3, 4 and 5. All of the subfolders of A have various files in them (e.g /A/1/file.

## How to make the child's tree of the parent categories?

I have a problem when i want to create tree structure in my data this is my data for sample \$categories = array( array( 'id' => 2 , 'name' => 'banana', 'parent' => 1 ), array( 'id' => 1 , 'name' => 'fruit', 'parent' => 0 ), array( 'id' =

## Loop in a binary tree represented as an adjacency list

I attained an interview where I was asked a question as below: You are given with parent -----> child relationships i.e. N1 ---> N2 where N1 is the parent of N2. This is nothing but representing a binary tree in adjacency list form. So I had to find

## Haskell: version of the recursion of the tail of the depth of the binary tree

First of all I have two different implementation that I believe are correct, and have profiled them and thinking they are about of the same performance: depth::Tree a -> Int depth Empty = 0 depth (Branch b l r) = 1 + max (depth l) (depth r) depthTail

## Automatic correction algorithm

I want to implement the following in C++: 1) Check whether the given word exists in a dictionary. The dictionary file is a huge file; consider 100MB or 3-4 Million words. 2) Suggest corrections for the incorrect word. 3) Autocomplete feature. My Appr

## Drawing of trees without any constraint on the degrees

I'm working on visualization of my distributed algorithm which solves problems on trees. I have to draw a rooted tree which is given as an input. Currently, I know how to handle the case if every node has at most 2 children. In this situation, for ev

## What is the problem with my + = operator of the binary search tree?

I have some lines of code about a binary search tree (BSTreeBag) which I can not quite figure out. The "operator +=(const BSTreeBag& addend)" requires to insert what's in the addend into the current tree we have. If the current tree we have

## Insert in the red black tree

I am taking an algorithms course and in my course slides, there is an example of insertion into a red-black tree: My question is, why don't we let "2" be a leaf node here? It looks like if we let it be a leaf node, then no condition of a red bla

## Search an item in D3 - force or tree layout

Is there an example of searching for an element in a d3js layout (force directed or tree) and highlighting that element? I am thinking that there would be a text field where user enters values to search.I wrote a tool that allows browsing biological

## Find all paths through a tree (nested dicts) from top to bottom

EDIT: See below for a suggested answer and how it's not quite right yet. There are many similar questions to this one on Stack Overflow, but none exactly like it in Python. I'm a programming novice, so please go easy. I have a tree of nested dictiona

## Make a BST prolog from a list and return it in the parameter

I need to make a prolog predicate from_list/2 so that if i call from_list([], T) I will get back a tree containg the items in the list(ints) so far I have: from_list([], empty). from_list([X], T) :- insert(X, empty, T). from_list([X|Y], T) :- from_li

## Insert in the binary tree without input sort

how can you build binary tree without sorting it, I.E if i have a input 5 4 9 8 1 2 7 how can you insert that into a reference based binary tree. I know this can be easily implemented with Array, but is it possible with reference base? Tree buildTree

## Given a binary search tree and a number, find a path whose node data was added to be the given number.

Given a binary search tree and a number, find if there is a path from root to a leaf such that all numbers on the path added up to be the given number. I know how to do it by recursively. But, I prefer an iterative solution. If we iterate from root t

## Cross a tree dump (graph) similar to a diagram using C

I have a Scheme-like tree graph structure. I want to parse it using C into some in-memory representation and walk over it. It there any library or front-end of parser to do this? EDIT: I have parsed the following expression true && (false || true)

## Tree data structure with 2 different key types and a minimum redundant code

I'm programming a prefix tree in C to store IP-Prefixes. The keys are the IP-Prefixes. I would like to use it with 32bit or 128bit keys (IPv4/IPv6 addresses). The insert/remove/lookup functions need to call different bitop functions for the ipv4 or i

## Code Synthesis - C ++ / Tree Subnode Serialization

I'm using this great tool (http://www.codesynthesis.com/products/xsd/c++/tree/) to convert xsd into c++ code. I'm trying to obtain the xml string from a sub node, but the only thing that i can get is the all xml, like this: the all xml: <?xml version

## Which tree should I use for indexing?

I'm thinking of experimenting with using a tree-structure for indexing as I want to test whether it is faster than my current indexing implementation which is in essence a hash based lookup. I've read up on various questions and articles about perfor

## Crossing the SQL tree

I am not totally sure I am naming this right, but please bear with me. I am wondering if is possible to do something like this in SQL(MySQL specifically): Let's say we have tree-like data that is persisted in the database in the following table: mysq

## How to exclude rows where the corresponding join is in a SQL tree

Update: After playing around with this for a few hours, went with a multi-query solution and used a table that only contained parent attributes to determine which items needed updating. Sorry for the poor title, I couldn't think how to concisely desc

## Transform the map with multiple values ​​to the tree?

Given a randomly distributed set of keys, with each key mapped to a set of values, how would you transform it into multiple trees? Example Data Set NB2 => {NC2 ND2} ND1 => {NG1 NH1} NA1 => {NB1} NB1 => {NC1 ND1 NE1} NA2 => {NB2} NC1 => {