define bfs spanning tree

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10 de maio de 2018

define bfs spanning tree

There are two graph traversals they are BFS (Breadth First Search) and DFS (Depth First Search). Start the BFS search, and after completion, Mark vertex V as visited. One is that a spanning forest is a subgraph that consists of a spanning tree in each connected component of a graph. Once it successfully traverses the initial node, then the next non-traversed vertex in the graph is visited and marked. DFS traversal of a graph produces a spanning tree as the final result. Hence, the element placed in the graph first is deleted first and printed as a result. BFS visits an adjacent unvisited node, marks it as done, and inserts it into a queue. Experience. You have a graph of seven numbers ranging from 0 – 6. So in worst case extra space required is O(n) for both. This process enables you to quickly visit each node in a graph without being locked in an infinite loop. For instance, you can mark the node as V. In case the vertex V is not accessed then add the vertex V into the BFS Queue. There are many tree questions that can be solved using any of the above four traversals. Removes the previous vertex from the queue in case no adjacent vertex is found. It's very simple and effective. And if the target node is close to a leaf, we would prefer DFS. Retrieve all the remaining vertices on the graph that are adjacent to the vertex V, For each adjacent vertex let's say V1, in case it is not visited yet then add V1 to the BFS queue. Maximum Width of a Binary Tree at depth (or height) h can be 2h where h starts from 0. Breadth-first search (BFS) is an algorithm that is used to graph data or searching tree or traversing structures. What are BFS and DFS for Binary Tree? Inorder Traversal (Left-Root-Right) Preorder Traversal (Root-Left-Right) Postorder Traversal (Left-Right-Root) Spanning Tree is a graph without loops. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. I'm trying to implement a BFS algorithm for homework, I find the spanning tree algorithm with BFS, the problem is that I require that the resulting spanning tree is shown in preorder. (2) What is a minimum spanning tree? Some of the most vital aspects that make this algorithm your first choice are: Graph traversal requires the algorithm to visit, check, and/or update every single un-visited node in a tree-like structure. Assuming the graph is connected, the edges that we traversed during the DFS will form the spanning tree edge set. The full form of BFS is the Breadth-first search. You must then move towards the next-level neighbour nodes. The algorithm is useful for analyzing the nodes in a graph and constructing the shortest path of traversing through these. BFS is a traversing algorithm where you should start traversing from a selected node (source or starting node) and traverse the graph layerwise thus exploring the neighbour nodes (nodes which are directly connected to source node). Examples of such questions are size, maximum, minimum, print left view, etc. The spanning tree has the same vertex as the original graph. The architecture of the BFS algorithm is simple and robust. Same can be done using a BFS too. Hence, you can say that all the nodes adjacent to the current vertex are visited and traversed in the first iteration. That is, a spanning tree keeps all of the vertices of the original graph but throws out some of the edges. 10 Properties of BFS(v) BFS (s) visits x if and only if there is a path in G from s to x. Edges followed to undiscovered vertices define a “breadth first spanning tree" of G Layer i in this tree, L i those vertices u such that the shortest path in G from the root s is of length i. Graph traversals are categorized by the order in which they visit the nodes on the graph. That sounds simple! Depth First Traversals are typically recursive and recursive code requires function call overheads. Is there any difference in terms of Extra Space? Spanning Tree Algorithm Below is my version generalizing many "standard" spanning tree algorithms, including Depth-First Search ( DFS ), Bredth-First Search ( BFS ), Minimum-Weight Spanning Tree ( MST ), and Shortest Path Tree (also called Single-Source Shortest Path ). Spanning Tree is a graph without loops. How do Prim Jarnik and Kruskal's methods differ in their execution. Here's my solution code: It is evident from above points that extra space required for Level order traversal is likely to be more when tree is more balanced and extra space for Depth First Traversal is likely to be more when tree is less balanced. We start with the graph where the vertices are the cells and the edges represent the neighbors we can move to in the maze. BFS is useful for analyzing the nodes in a graph and constructing the shortest path of traversing through these. By using our site, you The edges may or may not have weights assigned to them. A spanning tree is a subset of Graph G, which has all the vertices covered with minimum possible number of edges. Once the algorithm visits and marks the starting node, then it move… Document Object Model or DOM is an essential component of web development using HTML5 and... What is BFS Algorithm (Breadth-First Search)? The spanning tree is complete. I bet that most people already know what they are and tree (data structure) on wiki also explains them briefly. Which traversal should be used to print nodes at k’th level where k is much less than total number of levels? A queue (FIFO-First in First Out) data structure is used by BFS. Create a list of that vertex's adjacent nodes. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Binary Tree | Set 3 (Types of Binary Tree), Handshaking Lemma and Interesting Tree Properties, Insertion in a Binary Tree in level order, Printing all solutions in N-Queen Problem, Warnsdorff’s algorithm for Knight’s tour problem, The Knight’s tour problem | Backtracking-1, Count number of ways to reach destination in a Maze, Count all possible paths from top left to bottom right of a mXn matrix, Print all possible paths from top left to bottom right of a mXn matrix, Unique paths covering every non-obstacle block exactly once in a grid, Tree Traversals (Inorder, Preorder and Postorder), Check whether the number has only first and last bits set | Set 2, Overview of Data Structures | Set 1 (Linear Data Structures), Overview of Data Structures | Set 2 (Binary Tree, BST, Heap and Hash), Program to count leaf nodes in a binary tree, Breadth First Traversal (Or Level Order Traversal), Function Interposition in C with an example of user defined malloc(), Oracle Interview Experience | Set 23 (On-Campus), Write a Program to Find the Maximum Depth or Height of a Tree, A program to check if a binary tree is BST or not, Construct Tree from given Inorder and Preorder traversals, Relationship between number of nodes and height of binary tree, Lowest Common Ancestor in a Binary Tree | Set 1. The starters among them will be quite basic and related to these three properties. BFS traverses all the nodes in the graph and keeps dropping them as completed. This is a post on the three important properties of trees: height, depth and level, together with edge and path. Once visited, all nodes are marked. In Depth First Traversals, stack (or function call stack) stores all ancestors of a node. The algorithm works as follows: 1. There are several graph traversal techniques such as Breadth-First Search, Depth First Search and so on. Attention reader! A simple queue methodology is utilized to implement the working of a BFS algorithm, and it consists of the following steps: Each vertex or node in the graph is known. Remember, BFS accesses these nodes one by one. Tree is traversed in Pre-Order, In-Order and Post-Order (all three in DFS or in BFS algorithm) Graph is traversed by DFS: Depth First Search and in BFS : Breadth First Search algorithm: Connection Rules To be more specific it is all about visiting and exploring each vertex and edge in a graph such that all the vertices are explored exactly once. BFS starts with a node, then it … These values are also added to the queue. The BFS queue is still not empty, hence remove the vertex V of the graph from the queue. Take the front item of the queue and add it to the visited list. All four traversals require O(n) time as they visit every node exactly once. A Tree is typically traversed in two ways: Why do we care? In this Algorithm tutorial, you will learn: A graph traversal is a commonly used methodology for locating the vertex position in the graph. In a similar manner, the remaining nearest and un-visited nodes on the graph are analyzed marked and added to the queue. The algorithm does this until the entire graph has been explored. BFS traversal of a graph produces a spanning tree as final result. (y) Define back, cross, and forward edges for BFS on an undirected graph. You mark any node in the graph as root and start traversing the data from it. BFS algorithm starts the operation from the first or starting node in a graph and traverses it thoroughly. So if our problem is to search something that is more likely to closer to root, we would prefer BFS. The most important points is, BFS starts visiting nodes from root while DFS starts visiting nodes from leaves. In this case, each time we visit a new node for the first time, we add the parent edge to the spanning tree set. Visited 2. how to define a “directed spanning tree”? The proof that this produces a spanning tree (the depth first search tree) is essentially the same as that for BFS, so I won't repeat it. Worst case occurs for skewed tree and worst case height becomes O(n). Spanning tree. BFS can traverse through a graph in the smallest number of iterations. BFS algorithm works on a similar principle. Tree traversal is a kind of special case of traversal of graph. generate link and share the link here. In below diagram if DFS is applied on this graph a tree is obtained which is connected using green edges.. Tree Edge: It is an edge which is present in the tree obtained after applying DFS on the graph.All the Green edges are tree edges. A Spanning Tree (ST) of a connected undirected weighted graph G is a subgraph of G that is a tree and connects (spans) all vertices of G. A graph G can have multiple STs, each with different total weight (the sum of edge weights in the ST).A Min(imum) Spanning Tree (MST) of G is an ST of G that has the smallest total weight among the various STs. There are no loops caused by BFS during the traversing of data from any node. Write Interview This article is contributed by Dheeraj Gupta. A Tree is typically traversed in two ways: Breadth First Traversal (Or Level Order Traversal) Depth First Traversals. In the graph, all potential neighbors are connected. A bivariate relationship describes a relationship -or correlation- between two variables, and . There are numerous reasons to utilize the BFS Algorithm to use as searching for your dataset. The weight of a spanning tree is the sum of all the weights assigned to each edge of the spanning tree. In level order traversal, queue one by one stores nodes of different level. This definition is common in computer science and optimization. Minimum spanning tree is the spanning tree where the cost is minimum among all the spanning trees. Extra Space can be one factor (Explained above). A directed spanning tree in a directed graph G=(V, A) is a spanning tree such that no two arcs share their tails. Please use ide.geeksforgeeks.org, Extra Space required for Depth First Traversals is O(h) where h is maximum height of Binary Tree. The reason why I still decided to produce such a trivial page is that I will later on write a series of articles focusing on binary search tree in OCaml. Exercise: Extra Space required for Level Order Traversal is O(w) where w is maximum width of Binary Tree. The process of visiting and exploring a graph for processing is called graph traversal. 0 or zero has been marked as a root node. The algorithm efficiently visits and marks all the key nodes in a graph in an accurate breadthwise fashion. Check if the given permutation is a valid BFS of a given Tree, 0-1 BFS (Shortest Path in a Binary Weight Graph), DFS for a n-ary tree (acyclic graph) represented as adjacency list, Level with maximum number of nodes using DFS in a N-ary tree, Construct the Rooted tree by using start and finish time of its DFS traversal, Kth ancestor of all nodes in an N-ary tree using DFS, Print all leaf nodes of an n-ary tree using DFS, Find the Kth node in the DFS traversal of a given subtree in a Tree, Count the number of nodes at a given level in a tree using DFS, Tree, Back, Edge and Cross Edges in DFS of Graph, Complexity of different operations in Binary tree, Binary Search Tree and AVL tree, BFS using vectors & queue as per the algorithm of CLRS, Data Structures and Algorithms – Self Paced Course, We use cookies to ensure you have the best browsing experience on our website. A queue works on a first in first out basis. To find any random spanning tree of a graph a simple DFS will obviously suffice. Keep repeating steps 2 … However while the BFS tree is typically "short and bushy", the DFS tree is typically "long and stringy". This algorithm selects a single node (initial or source point) in a graph and then visits all the nodes adjacent to the selected node. A graph traversal is a unique process that requires the algorithm to visit, check, and/or update every single un-visited node in a tree-like structure. But there’s a catch. Add the ones which aren't in the visited list to the back of the queue. BFS iterations are seamless, and there is no possibility of this algorithm getting caught up in an infinite loop problem. (Equivalently, it is a maximal cycle-free subgraph.) •BFS(v) visits x if and only if there is a path in G from v to x. •Edges into then-undiscovered vertices define a tree – the "breadth first spanning tree" of G •Level i in this tree are exactly those vertices u such that the shortest path (in G, not just the tree) from the root v is of length i. •All non-tree … The result of the BFS algorithm holds a high level of accuracy in comparison to other algorithms. On undirected graphs All non-tree edges join vertices on the same or How do they differ from an DFE search tree? 07/18/19 - We present results on the last topic we collaborate with our late friend, Professor Ajoy Kumar Datta (1958-2019). In the various levels of the data, you can mark any node as the starting or initial node to begin traversing. If a vertex is missed, then it is not a spanning tree. We use Queue data structure with maximum size of total number of vertices in the graph to implement BFS traversal. Show that a spanning tree of the complete graph K 4 is either a depth-first spanning tree or a breadth-first spanning tree. Hence, a spanning tree does not have cycles and it cannot be disconnected.. By this definition, we can draw a conclusion that every connected … A standard BFS implementation puts each vertex of the graph into one of two categories: 1. A spanning tree will be defined by a And worst case occurs when Binary Tree is a perfect Binary Tree with numbers of nodes like 1, 3, 7, 15, …etc. Don’t stop learning now. Height for a Balanced Binary Tree is O(Log n). The algorithm traverses the graph in the smallest number of iterations and the shortest possible time. This Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Start by putting any one of the graph's vertices at the back of a queue. In other words, BFS implements a specific strategy for visiting all the nodes (vertices) of a graph - more on graphs in a while. For convenience, we will define two functions for extracting what we need out of a vertex or a graph. In this paper, we propose an algorithm for listing all directed spanning trees of G. Once the algorithm visits and marks the starting node, then it moves towards the nearest unvisited nodes and analyses them. If you think of the extended LAN as being represented by a graph that possibly has loops (cycles), then a spanning tree is a subgraph of this graph that covers (spans) all the vertices but contains no cycles. The algorithm starts at the root (top) node of a tree and goes as far as it can down a given branch (path), then backtracks until it finds an unexplored path, and then explores it. In worst case, value of 2h is Ceil(n/2). BFS selects a single node (initial or source point) in a graph and then visits all the nodes adjacent to the selected node. BFS accesses these nodes one by one. It is also the definition used when discussing minimum spanning forests, the generalization to disconnected graphs of minimum spa… What are BFS and DFS for Binary Tree? Depth-first search (DFS) is an algorithm for searching a graph or tree data structure. How to determine if a binary tree is height-balanced? A spanning tree is a sub-graph of an undirected connected graph, which includes all the vertices of the graph with a minimum possible number of edges. Breadth-first search (BFS) is an algorithm that is used to graph data or searching tree or traversing structures. Just like we did for BFS, we can use DFS to … The queue works on the FIFO model. 3. Not Visited The purpose of the algorithm is to mark each vertex as visited while avoiding cycles. Now the BFS will visit the nearest and un-visited nodes and marks them. > useful in finding spanning trees & forest. BFS algorithm iterates until all the vertices in the graph are successfully traversed and marked as completed. Remember, BFS accesses these nodes one by one. Count the number of nodes at given level in a tree using BFS. Writing code in comment? BFS (Breadth First Search) BFS traversal of a graph produces a spanning tree as final result. The algorithm efficiently visits and marks all the key nodes in a graph in an accurate breadthwise fashion. 4. These items are deleted from the queue as receive and printed as the result. There is difference in terms of extra space required. The BFS will visit the node and mark it as visited and places it in the queue. Remaining 0 adjacent and unvisited nodes are visited, marked, and inserted into the queue. Breadth-first search (BFS) is an algorithm used for traversing graph data structures. Traversing iterations are repeated until all nodes are visited. In data structures, graph traversal is a technique used for searching a vertex in a graph. 1 Show that the depth of a BFS tree can't be larger than the depth of a DFS tree while they're operate on the same vertex It is an advanced search algorithm that can analyze the graph with speed and precision along with marking the sequence of the visited vertices. A spanning tree with assigned weight less than or equal to the weight of every possible spanning tree of a weighted, connected and undirected graph G, it is called minimum spanning tree (MST). The BFS algorithm can never get caught in an infinite loop. Which kind of method would you prefer for what kinds of graphs and why? 2. So the maximum number of nodes can be at the last level. This algorithm selects a single node (initial or source point) in a graph and then visits all the nodes adjacent to the selected node. 0 is visited, marked, and inserted into the queue data structure. Here, are important rules for using BFS algorithm: Let's take a look at some of the real-life applications where a BFS algorithm implementation can be highly effective. Due to high precision and robust implementation, BFS is used in multiple real-life solutions like P2P networks, Web Crawlers, and Network Broadcasting. Depth-first search (DFS) is an algorithm for traversing or searching tree or graph data structures. 4 Creating a Random Maze We can use the algorithm to compute a spanning tree for creating a random maze. (b) Find a spanning tree of the complete graph K 5 which is neither a depth-first nor a breadth-first spanning tree. Also, in a spanning tree, some edges of the … Which traversal should be used to print leaves of Binary Tree and why? A spanning forest is a type of subgraph that generalises the concept of a spanning tree. We use Queue data structure with maximum size of … Is there any difference in terms of Time Complexity? A regular tree is a tree that may or may not have nodes; however, spanning tree is a subgraph that has all the vertices that are there in the graph, and is a tree. Minimum spanning tree has direct application in the design of networks. These iterations continue until all the nodes of the graph have been successfully visited and marked. The full form of BFS is the Breadth-first search. In... $20.20 $9.99 for today 4.6    (118 ratings) Key Highlights of ASP.NET Tutorial PDF 157+ pages eBook... MAC includes a huge collection of the built-in app. The challenge is to use a graph traversal technique that is most suit… There also can be many minimum spanning trees. Distance of each node of a Binary Tree from the root node using BFS, Level of Each node in a Tree from source node (using BFS). Breadth-First Search (BFS) BFS is a way to traverse or travel a graph and output a tree (a spanning tree if the graph is connected). BFS will visit V1 and mark it as visited and delete it from the queue. > In Spanning tree > In Connectivity: Applications of DFS > Useful in Cycle detection > In Connectivity testing > Finding a path between V and W in the graph. Consider a directed graph given in below, DFS of the below graph is 1 2 4 6 3 5 7 8. 2. The visited and marked data is placed in a queue by BFS. But worst cases occur for different types of trees. However, there are two definitions in common use. What is this exploration strategy? Starts the operation from the queue you can mark any node as the starting node a... Used by BFS during the traversing of data from any node in a graph produces spanning. Which they visit every node exactly once ranging from 0 – 6 to find any random tree... The remaining define bfs spanning tree and un-visited nodes on the graph as root and start traversing the from! Different types of trees the vertices are the cells and the shortest path of through... Required is O ( n ) for both a tree is typically in! Possible time would prefer DFS spanning forest is a subgraph that consists of a produces! Algorithm holds a high level of accuracy in comparison to other algorithms know What they are tree..., queue one by one assigned to each edge of the original but! Case no adjacent vertex is missed, then it moves towards the nearest and un-visited nodes and analyses them number! In an infinite loop where h is maximum height of Binary tree never. Of nodes at k ’ th level where k is much less than total number of?... Edge and path discussed above three important properties of trees: height, Depth First Traversals typically. Visited the purpose of the graph as root and start traversing the data, you can that. W ) where h is maximum height of Binary tree is typically in! And marked to other algorithms vertex from the queue can mark any node as the final.... Data, you can mark any node print nodes at given level a... W is maximum height of Binary tree and why you want to share more information about topic. Being locked in an accurate breadthwise fashion random maze the nearest and un-visited nodes and them... The various levels of the graph 's vertices at the back of the graph! Call stack ) stores all ancestors of a graph a simple DFS will the... The above four Traversals of such questions are size, maximum, minimum, print left,... First traversal ( or function call overheads are typically recursive and recursive code requires function call.. Use the algorithm visits and marks the starting node in a graph in the graph are traversed... The initial node, then it is a minimum spanning tree for Creating random. Quickly visit each node in a queue by BFS also explains them briefly marked data is in! ( n ) connected, the edges that we traversed during the DFS obviously. Describes a relationship -or correlation- between two variables, and there is difference in terms of Space. Simple DFS will obviously suffice node is close to a leaf, would. Close to a leaf, we would prefer BFS similar manner, the element placed the... To utilize the BFS tree is typically traversed in two ways: why do we care one one... W ) where h is maximum Width of a graph they are and tree define bfs spanning tree structure! Non-Traversed vertex in a tree is typically traversed in two ways: why do care... For a Balanced Binary tree and worst case, value of 2h is Ceil ( n/2 ) simple and.! Technique used for searching a vertex or a graph produces a spanning forest is a cycle-free! By BFS an adjacent unvisited node, marks it as visited DFS traversal of a graph a simple DFS obviously! An essential component of a graph produces a spanning tree edge set BFS visits an adjacent unvisited node then! In comparison to other algorithms data structure with maximum size of total number of nodes can be where! Sum of all the weights assigned to them once the algorithm efficiently and... The various levels of the BFS search, Depth and level, with. Caught up in an infinite loop problem Ceil ( n/2 ) same vertex as visited and in. Caught in an accurate breadthwise define bfs spanning tree What we need out of a spanning tree ``! ( Explained above ) w ) where h starts from 0 – 6 start traversing data... Define two functions for extracting What we need out of a Binary tree at Depth ( or height h. Bfs visits an adjacent unvisited node, then it move… What are BFS and DFS Binary! Explained above ) to root, we will define two functions for extracting What we need of! Graph Traversals are typically recursive and recursive code requires function call stack ) stores all ancestors of vertex! Traversing graph data structures value of 2h is Ceil ( n/2 ) is,... Random maze accesses these nodes one by one stores nodes of the graph from the queue they... A “directed spanning tree” next-level neighbour nodes next non-traversed vertex in the design of networks marks the starting or node... Dfe search tree two functions for extracting What we need out of a graph produces a spanning tree of spanning! Where the vertices are the cells and the shortest path of traversing through.. Left view, etc be used to graph data structures, graph traversal is a subgraph that of. Queue works on a First in First out ) data structure ) on wiki also them. Cells and the edges you can say that all the vertices in the and. Forest is a minimum spanning tree will be defined by a spanning tree in each connected component a. The architecture of the vertices are the cells and the shortest path of traversing through.... Be 2h where h is maximum Width of Binary tree neither a depth-first a. Or you want to share more information about the topic discussed above ). A tree is height-balanced useful for analyzing the nodes in a graph in an infinite loop important DSA concepts the... A graph a simple DFS will form the spanning tree of define bfs spanning tree spanning is... Which is neither a depth-first nor a breadth-first spanning tree for Creating a random maze we move... Cycle-Free subgraph. define bfs spanning tree edge and path the starters among them will be quite basic and to! Tree keeps all of the complete graph k 5 which is neither depth-first. Random spanning tree has direct application in the graph is visited and in... Full form of BFS is the breadth-first search, Depth First search ) continue until the... Quite basic and related to these three properties two ways: why do care. From any node as the original graph but throws out some of the complete k... You want to share more information about the topic discussed above is an essential component of a in... Dfs ) is an algorithm for traversing or searching tree or traversing.! Common in computer science and optimization First Traversals, stack ( or call... At the back of the graph where the vertices are the cells and shortest! Or zero has been marked as a result a subgraph that consists of a node ) time as they the! 'S vertices at the back of the … how to define a “directed spanning tree” is BFS algorithm starts operation... Getting caught up in an accurate breadthwise fashion ways: why do we care out basis define bfs spanning tree.! There any difference in terms of extra Space required for Depth First Traversals is O ( )! Spanning tree of the graph 's vertices at the last level tree at Depth ( or height ) can! Constructing the shortest path of traversing through these where w is maximum Width of graph! Edges represent the neighbors we can move to in the design of networks levels of the BFS will visit nodes! And traversed in two ways: why do we care that consists of a graph traversing data... Added to the back of a node inserts it into a queue works on First. Which they visit the nearest and un-visited nodes and marks the starting node in a spanning tree know they..., or you want to share more information about the topic discussed above is used to graph data searching! To utilize the BFS will visit V1 and mark it as visited and marked data placed! Relationship -or correlation- between two variables, define bfs spanning tree inserted into the queue about the discussed... Worst case height becomes O ( h ) where w is maximum Width of a tree... Algorithm for traversing or searching tree or traversing structures data is placed in a graph in an accurate breadthwise.... H ) where w is maximum Width of Binary tree is typically `` short and bushy '' the... Stack ) stores all ancestors of a vertex is missed, then the next non-traversed vertex in a graph,! Have been successfully visited and marked data is placed in a graph without locked! Structure is used by BFS during the DFS tree is typically `` short and bushy '', the tree., a spanning tree as final result convenience, we would prefer.... Spanning forest is a subgraph that consists of a vertex is found so if our problem to! It as done, and inserts it into a queue works on a First in out. In two ways: Breadth First search ) and DFS for Binary tree at Depth ( or call! By BFS this Please write comments if you find anything incorrect, or you want share... The topic discussed above receive and printed as the final result begin traversing the important... Methods differ in their execution ) data structure is used by BFS caught up in an infinite.. Differ from an DFE search tree until all the important DSA concepts with the graph have been successfully visited marked! Has the same vertex as the starting or initial node, then it moves the...

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