Šioje pamokoje sužinosite apie subalansuotą dvejetainį medį ir jo skirtingus tipus. Taip pat rasite subalansuoto dvejetainio medžio C, C ++, Java ir Python pavyzdžius.
Subalansuotas dvejetainis medis, dar vadinamas aukščio subalansuotu dvejetainiu medžiu, apibrėžiamas kaip dvejetainis medis, kuriame bet kurio mazgo kairiojo ir dešiniojo pogrindžio aukštis skiriasi ne daugiau kaip 1.
Norėdami sužinoti daugiau apie medžio / mazgo aukštį, apsilankykite medžio duomenų struktūroje. Toliau pateikiamos aukščio subalansuoto dvejetainio medžio sąlygos:
- bet kurio mazgo kairiojo ir dešiniojo potemių skirtumas yra ne daugiau kaip vienas
- kairysis potis yra subalansuotas
- dešinysis potis yra subalansuotas
Subalansuotas dvejetainis medis su gyliu kiekviename lygyje 
Nesubalansuotas dvejetainis medis su gyliu kiekviename lygyje
„Python“, „Java“ ir „C / C ++“ pavyzdžiai
Šis kodas skirtas patikrinti, ar medis yra subalansuotas pagal aukštį.
„Python Java C C ++“ # Checking if a binary tree is CalculateHeight balanced in Python # CreateNode creation class CreateNode: def __init__(self, item): self.item = item self.left = self.right = None # Calculate height class CalculateHeight: def __init__(self): self.CalculateHeight = 0 # Check height balance def is_height_balanced(root, CalculateHeight): left_height = CalculateHeight() right_height = CalculateHeight() if root is None: return True l = is_height_balanced(root.left, left_height) r = is_height_balanced(root.right, right_height) CalculateHeight.CalculateHeight = max( left_height.CalculateHeight, right_height.CalculateHeight) + 1 if abs(left_height.CalculateHeight - right_height.CalculateHeight) <= 1: return l and r return False CalculateHeight = CalculateHeight() root = CreateNode(1) root.left = CreateNode(2) root.right = CreateNode(3) root.left.left = CreateNode(4) root.left.right = CreateNode(5) if is_height_balanced(root, CalculateHeight): print('The tree is balanced') else: print('The tree is not balanced')
// Checking if a binary tree is height balanced in Java // Node creation class Node ( int data; Node left, right; Node(int d) ( data = d; left = right = null; ) ) // Calculate height class Height ( int height = 0; ) class BinaryTree ( Node root; // Check height balance boolean checkHeightBalance(Node root, Height height) ( // Check for emptiness if (root == null) ( height.height = 0; return true; ) Height leftHeighteight = new Height(), rightHeighteight = new Height(); boolean l = checkHeightBalance(root.left, leftHeighteight); boolean r = checkHeightBalance(root.right, rightHeighteight); int leftHeight = leftHeighteight.height, rightHeight = rightHeighteight.height; height.height = (leftHeight> rightHeight ? leftHeight : rightHeight) + 1; if ((leftHeight - rightHeight>= 2) || (rightHeight - leftHeight>= 2)) return false; else return l && r; ) public static void main(String args()) ( Height height = new Height(); BinaryTree tree = new BinaryTree(); tree.root = new Node(1); tree.root.left = new Node(2); tree.root.right = new Node(3); tree.root.left.left = new Node(4); tree.root.left.right = new Node(5); if (tree.checkHeightBalance(tree.root, height)) System.out.println("The tree is balanced"); else System.out.println("The tree is not balanced"); ) )
// Checking if a binary tree is height balanced in C #include #include #define bool int // Node creation struct node ( int item; struct node *left; struct node *right; ); // Create a new node struct node *newNode(int item) ( struct node *node = (struct node *)malloc(sizeof(struct node)); node->item = item; node->left = NULL; node->right = NULL; return (node); ) // Check for height balance bool checkHeightBalance(struct node *root, int *height) ( // Check for emptiness int leftHeight = 0, rightHeight = 0; int l = 0, r = 0; if (root == NULL) ( *height = 0; return 1; ) l = checkHeightBalance(root->left, &leftHeight); r = checkHeightBalance(root->right, &rightHeight); *height = (leftHeight> rightHeight ? leftHeight : rightHeight) + 1; if ((leftHeight - rightHeight>= 2) || (rightHeight - leftHeight>= 2)) return 0; else return l && r; ) int main() ( int height = 0; struct node *root = newNode(1); root->left = newNode(2); root->right = newNode(3); root->left->left = newNode(4); root->left->right = newNode(5); if (checkHeightBalance(root, &height)) printf("The tree is balanced"); else printf("The tree is not balanced"); )
// Checking if a binary tree is height balanced in C++ #include using namespace std; #define bool int class node ( public: int item; node *left; node *right; ); // Create anew node node *newNode(int item) ( node *Node = new node(); Node->item = item; Node->left = NULL; Node->right = NULL; return (Node); ) // Check height balance bool checkHeightBalance(node *root, int *height) ( // Check for emptiness int leftHeight = 0, rightHeight = 0; int l = 0, r = 0; if (root == NULL) ( *height = 0; return 1; ) l = checkHeightBalance(root->left, &leftHeight); r = checkHeightBalance(root->right, &rightHeight); *height = (leftHeight> rightHeight ? leftHeight : rightHeight) + 1; if ((leftHeight - rightHeight>= 2) || (rightHeight - leftHeight>= 2)) return 0; else return l && r; ) int main() ( int height = 0; node *root = newNode(1); root->left = newNode(2); root->right = newNode(3); root->left->left = newNode(4); root->left->right = newNode(5); if (checkHeightBalance(root, &height)) cout << "The tree is balanced"; else cout << "The tree is not balanced"; )
Subalansuotos dvejetainių medžių programos
- AVL medis
- Subalansuotas dvejetainis paieškos medis
