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Albero dei fattori di un dato numero

Factor Tree è un metodo intuitivo per comprendere i fattori di un numero. Mostra come tutti i fattori sono stati derivati ​​dal numero. È un diagramma speciale in cui trovi i fattori di un numero, quindi i fattori di quei numeri ecc. Fino a quando non puoi più fattorizzare. Gli estremi sono tutti i fattori primi del numero originale.

Esempio: 

Input : v = 48 Output : Root of below tree 48 / 2 24 / 2 12 / 2 6 / 2 3

L'albero dei fattori viene creato in modo ricorsivo. Viene utilizzato un albero binario. 



  1. Iniziamo con un numero e troviamo il minimo divisore possibile.
  2. Quindi dividiamo il numero genitore per il divisore minimo.
  3. Memorizziamo sia il divisore che il quoziente come due figli del numero genitore.
  4. Entrambi i bambini vengono mandati in funzione in modo ricorsivo.
  5. Se non viene trovato un divisore inferiore alla metà del numero, due figli vengono memorizzati come NULL.

Attuazione:

bloccare un'app Android
C++
// C++ program to construct Factor Tree for // a given number #include   using namespace std; // Tree node struct Node {  struct Node *left *right;  int key; }; // Utility function to create a new tree Node Node* newNode(int key) {  Node* temp = new Node;  temp->key = key;  temp->left = temp->right = NULL;  return temp; } // Constructs factor tree for given value and stores // root of tree at given reference. void createFactorTree(struct Node **node_ref int v) {  (*node_ref) = newNode(v);  // the number is factorized  for (int i = 2 ; i < v/2 ; i++)  {  if (v % i != 0)  continue;  // If we found a factor we construct left  // and right subtrees and return. Since we  // traverse factors starting from smaller  // to greater left child will always have  // smaller factor  createFactorTree(&((*node_ref)->left) i);  createFactorTree(&((*node_ref)->right) v/i);  return;  } } // Iterative method to find the height of Binary Tree void printLevelOrder(Node *root) {  // Base Case  if (root == NULL) return;  queue<Node *> q;  q.push(root);  while (q.empty() == false)  {  // Print front of queue and remove  // it from queue  Node *node = q.front();  cout << node->key << ' ';  q.pop();  if (node->left != NULL)  q.push(node->left);  if (node->right != NULL)  q.push(node->right);  } } // driver program int main() {  int val = 48;// sample value  struct Node *root = NULL;  createFactorTree(&root val);  cout << 'Level order traversal of '  'constructed factor tree';  printLevelOrder(root);  return 0; } 
Java
// Java program to construct Factor Tree for // a given number import java.util.*; class GFG {  // Tree node  static class Node  {  Node left right;  int key;  };  static Node root;  // Utility function to create a new tree Node  static Node newNode(int key)  {  Node temp = new Node();  temp.key = key;  temp.left = temp.right = null;  return temp;  }  // Constructs factor tree for given value and stores  // root of tree at given reference.  static Node createFactorTree(Node node_ref int v)  {  (node_ref) = newNode(v);  // the number is factorized  for (int i = 2 ; i < v/2 ; i++)  {  if (v % i != 0)  continue;  // If we found a factor we construct left  // and right subtrees and return. Since we  // traverse factors starting from smaller  // to greater left child will always have  // smaller factor  node_ref.left = createFactorTree(((node_ref).left) i);  node_ref.right = createFactorTree(((node_ref).right) v/i);  return node_ref;  }  return node_ref;  }  // Iterative method to find the height of Binary Tree  static void printLevelOrder(Node root)  {  // Base Case  if (root == null) return;  Queue<Node > q = new LinkedList<>();  q.add(root);  while (q.isEmpty() == false)  {  // Print front of queue and remove  // it from queue  Node node = q.peek();  System.out.print(node.key + ' ');  q.remove();  if (node.left != null)  q.add(node.left);  if (node.right != null)  q.add(node.right);  }  }  // Driver program  public static void main(String[] args)  {  int val = 48;// sample value  root = null;  root = createFactorTree(root val);  System.out.println('Level order traversal of '+  'constructed factor tree');  printLevelOrder(root);  } } // This code is contributed by Rajput-Ji 
Python3
# Python program to construct Factor Tree for # a given number class Node: def __init__(self key): self.left = None self.right = None self.key = key # Utility function to create a new tree Node def newNode(key): temp = Node(key) return temp # Constructs factor tree for given value and stores # root of tree at given reference. def createFactorTree(node_ref v): node_ref = newNode(v) # the number is factorized for i in range(2 int(v/2)): if (v % i != 0): continue # If we found a factor we construct left # and right subtrees and return. Since we # traverse factors starting from smaller # to greater left child will always have # smaller factor node_ref.left = createFactorTree(((node_ref).left) i) node_ref.right = createFactorTree(((node_ref).right) int(v/i)) return node_ref return node_ref # Iterative method to find the height of Binary Tree def printLevelOrder(root): # Base Case if (root == None): return q = []; q.append(root); while (len(q) > 0): # Print front of queue and remove # it from queue node = q[0] print(node.key end = ' ') q = q[1:] if (node.left != None): q.append(node.left) if (node.right != None): q.append(node.right) val = 48# sample value root = None root = createFactorTree(root val) print('Level order traversal of constructed factor tree') printLevelOrder(root) # This code is contributed by shinjanpatra 
C#
// C# program to construct Factor Tree for // a given number using System; using System.Collections.Generic; public class GFG {  // Tree node  public  class Node  {  public  Node left right;  public  int key;  };  static Node root;  // Utility function to create a new tree Node  static Node newNode(int key)  {  Node temp = new Node();  temp.key = key;  temp.left = temp.right = null;  return temp;  }  // Constructs factor tree for given value and stores  // root of tree at given reference.  static Node createFactorTree(Node node_ref int v)  {  (node_ref) = newNode(v);  // the number is factorized  for (int i = 2 ; i < v/2 ; i++)  {  if (v % i != 0)  continue;  // If we found a factor we construct left  // and right subtrees and return. Since we  // traverse factors starting from smaller  // to greater left child will always have  // smaller factor  node_ref.left = createFactorTree(((node_ref).left) i);  node_ref.right = createFactorTree(((node_ref).right) v/i);  return node_ref;  }  return node_ref;  }  // Iterative method to find the height of Binary Tree  static void printLevelOrder(Node root)  {  // Base Case  if (root == null) return;  Queue<Node > q = new Queue<Node>();  q.Enqueue(root);  while (q.Count != 0)  {  // Print front of queue and remove  // it from queue  Node node = q.Peek();  Console.Write(node.key + ' ');  q.Dequeue();  if (node.left != null)  q.Enqueue(node.left);  if (node.right != null)  q.Enqueue(node.right);  }  }  // Driver program  public static void Main(String[] args)  {  int val = 48;// sample value  root = null;  root = createFactorTree(root val);  Console.WriteLine('Level order traversal of '+  'constructed factor tree');  printLevelOrder(root);  } } // This code is contributed by gauravrajput1 
JavaScript
<script>  // Javascript program to construct Factor Tree for  // a given number    class Node  {  constructor(key) {  this.left = null;  this.right = null;  this.key = key;  }  }    let root;    // Utility function to create a new tree Node  function newNode(key)  {  let temp = new Node(key);  return temp;  }  // Constructs factor tree for given value and stores  // root of tree at given reference.  function createFactorTree(node_ref v)  {  (node_ref) = newNode(v);  // the number is factorized  for (let i = 2 ; i < parseInt(v/2 10) ; i++)  {  if (v % i != 0)  continue;  // If we found a factor we construct left  // and right subtrees and return. Since we  // traverse factors starting from smaller  // to greater left child will always have  // smaller factor  node_ref.left = createFactorTree(((node_ref).left) i);  node_ref.right = createFactorTree(((node_ref).right) parseInt(v/i 10));  return node_ref;  }  return node_ref;  }  // Iterative method to find the height of Binary Tree  function printLevelOrder(root)  {  // Base Case  if (root == null) return;  let q = [];  q.push(root);  while (q.length > 0)  {  // Print front of queue and remove  // it from queue  let node = q[0];  document.write(node.key + ' ');  q.shift();  if (node.left != null)  q.push(node.left);  if (node.right != null)  q.push(node.right);  }  }    let val = 48;// sample value  root = null;  root = createFactorTree(root val);  document.write('Level order traversal of '+  'constructed factor tree' + '
'
); printLevelOrder(root); // This code is contributed by suresh07. </script>

Produzione
Level order traversal of constructed factor tree48 2 24 2 12 2 6 2 3 

Complessità temporale: O(n) dove n è il numero dato.

Complessità spaziale: O(k) dove k è il fattore del numero.

 

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