Đây là một chương trình C ++ để triển khai Treap. Cấu trúc dữ liệu Treap về cơ bản là một cây tìm kiếm nhị phân ngẫu nhiên. Ở đây, chúng tôi sẽ xem xét các thao tác chèn, xóa và tìm kiếm trên này.
Chức năng và mô tả
function rotLeft () để xoay trái | Đầu tiên xoay cây sau đó đặt gốc mới. |
hàm rotRight () để xoay phải | Đầu tiên xoay cây sau đó đặt gốc mới. |
hàm insetNod () để chèn một khóa nhất định vào treap với mức độ ưu tiên một cách đệ quy -
If root = nullptr return data as root. If given data is less then root node, Insert data in left subtree. Rotate left if heap property violated. else Insert data in right subtree. Rotate right if heap property violated.
function searchNod () để tìm kiếm khóa trong treap một cách đệ quy -
If key is not present return false. If key is present return true. If key is less than root, search in left subtree. Else search in right subtree.
function deleteNod () để xóa khóa khỏi treap một cách đệ quy -
If key is not present return false If key is present return true. If key is less than root, go to left subtree. Else Go to right subtree. If key is found: node to be deleted which is a leaf node deallocate the memory and update root to null. delete root. node to be deleted which has two children if left child has less priority than right child call rotLeft() on root recursively delete the left child else call rotRight() on root recursively delete the right child node to be deleted has only one child find child node deallocate the memory Print the result. End
Ví dụ
#include <iostream> #include <cstdlib> #include <ctime> using namespace std; struct TreapNod { //node declaration int data; int priority; TreapNod* l, *r; TreapNod(int d) { //constructor this->data = d; this->priority = rand() % 100; this->l= this->r = nullptr; } }; void rotLeft(TreapNod* &root) { //left rotation TreapNod* R = root->r; TreapNod* X = root->r->l; R->l = root; root->r= X; root = R; } void rotRight(TreapNod* &root) { //right rotation TreapNod* L = root->l; TreapNod* Y = root->l->r; L->r = root; root->l= Y; root = L; } void insertNod(TreapNod* &root, int d) { //insertion if (root == nullptr) { root = new TreapNod(d); return; } if (d < root->data) { insertNod(root->l, d); if (root->l != nullptr && root->l->priority > root->priority) rotRight(root); } else { insertNod(root->r, d); if (root->r!= nullptr && root->r->priority > root->priority) rotLeft(root); } } bool searchNod(TreapNod* root, int key) { if (root == nullptr) return false; if (root->data == key) return true; if (key < root->data) return searchNod(root->l, key); return searchNod(root->r, key); } void deleteNod(TreapNod* &root, int key) { //node to be deleted which is a leaf node if (root == nullptr) return; if (key < root->data) deleteNod(root->l, key); else if (key > root->data) deleteNod(root->r, key); //node to be deleted which has two children else { if (root->l ==nullptr && root->r == nullptr) { delete root; root = nullptr; } else if (root->l && root->r) { if (root->l->priority < root->r->priority) { rotLeft(root); deleteNod(root->l, key); } else { rotRight(root); deleteNod(root->r, key); } } //node to be deleted has only one child else { TreapNod* child = (root->l)? root->l: root->r; TreapNod* curr = root; root = child; delete curr; } } } void displayTreap(TreapNod *root, int space = 0, int height =10) { //display treap if (root == nullptr) return; space += height; displayTreap(root->l, space); cout << endl; for (int i = height; i < space; i++) cout << ' '; cout << root->data << "(" << root->priority << ")\n"; cout << endl; displayTreap(root->r, space); } int main() { int nums[] = {1,7,6,4,3,2,8,9,10 }; int a = sizeof(nums)/sizeof(int); TreapNod* root = nullptr; srand(time(nullptr)); for (int n: nums) insertNod(root, n); cout << "Constructed Treap:\n\n"; displayTreap(root); cout << "\nDeleting node 8:\n\n"; deleteNod(root, 8); displayTreap(root); cout << "\nDeleting node 3:\n\n"; deleteNod(root, 3); displayTreap(root); return 0; }
Đầu ra
Constructed Treap: 1(12) 2(27) 3(97) 4(46) 6(75) 7(88) 8(20) 9(41) 10(25) Deleting node 8: 1(12) 2(27) 3(97) 4(46) 6(75) 7(88) 9(41) 10(25) Deleting node 3: 1(12) 2(27) 4(46) 6(75) 7(88) 9(41) 10(25)