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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Порядковые статистики. Дано число N и N строк. Каждая строка содержит команду добавления или удаления натуральных чисел, | ||
| а также запрос на получение k-ой порядковой статистики. Команда добавления числа A задается положительным числом A, | ||
| команда удаления числа A задается отрицательным числом “-A”. Запрос на получение k-ой порядковой статистики задается числом k. | ||
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| Вариант 7_3. Требуемая скорость выполнения запроса - O(log n) в среднем. В реализации используйте декартово дерево. | ||
| */ | ||
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| #include <cassert> | ||
| #include <iostream> | ||
| #include <string> | ||
| #include <memory.h> | ||
| #include <stdint.h> | ||
| #include <vector> | ||
| #include <queue> | ||
| #include <ctime> | ||
| #include <math.h> | ||
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| using namespace std; | ||
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| struct Node { | ||
| int value; | ||
| int priority; | ||
| int count; | ||
| Node* left = nullptr; | ||
| Node* right = nullptr; | ||
| Node(int value_, int priority_) : value(value_), priority(priority_), count(1) {} | ||
| }; | ||
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| class Treap { | ||
| public: | ||
| Treap() = default; | ||
| Treap(const Treap&) = delete; | ||
| Treap(const Treap&&) = delete; | ||
| Treap& operator= (const Treap&) = delete; | ||
| Treap& operator= (const Treap&&) = delete; | ||
| ~Treap(); | ||
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| void pre_order_print() const; | ||
| void insert(int key, int priority); | ||
| void erase(int key); | ||
| int kth_largest(int idx); | ||
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Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. const
Owner
Author
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Понял, исправил. Но не здесь. Здесь не знаю, как исправить прямо в пулл реквесте.
Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Делаешь еще один коммит в эту ветку и все) |
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| private: | ||
| Node* root = nullptr; | ||
| void split(Node* node, int key, Node*& left, Node*& right); | ||
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Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. static
Owner
Author
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Не понимаю, что такое static |
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| Node* merge(Node* left, Node* right); | ||
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Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. static
Owner
Author
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Не понимаю, что такое static
Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. static Node* merge(Node* left, Node* right) |
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| Node* kth_largest_(int idx, Node* node); | ||
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Collaborator
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. static
Owner
Author
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Не понимаю, что такое static. Это, вроде, глобальная переменная, но куда ее здесь не понятно. |
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| int get_count(Node* node) {return (node) ? node->count : 0; } | ||
| void update_count(Node* node) { | ||
| if (node) { | ||
| node->count = get_count(node->left) + get_count(node->right) + 1; | ||
| } | ||
| } | ||
| }; | ||
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| void Treap::pre_order_print() const { | ||
| Node* current = root; | ||
| vector<Node *> stack; | ||
| while (current || !stack.empty()) { | ||
| if (current) { | ||
| cout << current->value << ' ' << current->count << endl; | ||
| stack.push_back(current); | ||
| current = current->left; | ||
| } | ||
| else { | ||
| current = stack.back()->right; | ||
| stack.pop_back(); | ||
| } | ||
| } | ||
| cout << endl; | ||
| } | ||
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| void Treap::split(Node* node, int key, Node*& left, Node*& right) { | ||
| if (!node) { | ||
| left = right = nullptr; | ||
| } else if (node->value <= key){ | ||
| split(node->right, key, node->right, right); | ||
| left = node; | ||
| } else { | ||
| split(node->left, key, left, node->left); | ||
| right = node; | ||
| } | ||
| update_count(node); | ||
| } | ||
| Node* Treap::merge(Node *left, Node *right) { | ||
| if (!left || !right) { return left == 0 ? right : left; } | ||
| if (left->priority > right->priority) { | ||
| left->right = merge(left->right, right); | ||
| update_count(left); | ||
| return left; | ||
| } else { | ||
| right->left = merge(left, right->left); | ||
| update_count(right); | ||
| return right; | ||
| } | ||
| } | ||
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| //Реализация вставки номер 2 | ||
| void Treap::insert(int key, int priority) { | ||
| if (!root) { | ||
| root = new Node(key, priority); | ||
| return; | ||
| } | ||
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| Node* new_node = new Node(key, priority); | ||
| Node* current = root; | ||
| Node* parent = nullptr; | ||
| while (current && current->priority >= priority) { | ||
| parent = current; | ||
| current = (current->value <= key) ? current->right : current->left; | ||
| parent->count += 1; | ||
| } | ||
| split(current, key, new_node->left, new_node->right); | ||
| new_node->count += get_count(new_node->left) + get_count(new_node->right); | ||
| if ( !parent ) { | ||
| root = new_node; | ||
| return; | ||
| } | ||
| (parent->value <= key) ? parent->right = new_node : parent->left = new_node; | ||
| } | ||
| //Реализация удаления номер 1 | ||
| void Treap::erase(int key) { | ||
| Node* node_to_delete = nullptr; | ||
| Node* left = nullptr; | ||
| Node* right = nullptr; | ||
| split(root, key, left, right); | ||
| split(left, key-0.5, left ,node_to_delete); | ||
| root = merge(left, right); | ||
| delete node_to_delete; | ||
| } | ||
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| Node* Treap::kth_largest_(int idx, Node* node) { | ||
| if ( get_count(node->left) < idx ) { | ||
| return kth_largest_( idx-get_count(node->left)-1, node->right ); | ||
| } else if ( get_count(node->left) > idx ) { | ||
| return kth_largest_( idx, node->left ); | ||
| } else return node; | ||
| } | ||
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| int Treap::kth_largest(int idx) { | ||
| Node* node = kth_largest_(idx, root); | ||
| return node->value; | ||
| } | ||
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| Treap::~Treap() { | ||
| if (!root) return; | ||
| queue<Node* > q; | ||
| q.push(root); | ||
| while (!q.empty()) { | ||
| Node *node = q.front(); | ||
| q.pop(); | ||
| if (node->left != nullptr) q.push(node->left); | ||
| if (node->right != nullptr) q.push(node->right); | ||
| delete node; | ||
| } | ||
| } | ||
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| int main() { | ||
| int N; | ||
| Treap treap; | ||
| cin >> N; | ||
| for (int i = 0; i < N; ++i) { | ||
| int A, k; | ||
| cin >> A >> k; | ||
| int priority = rand() % 1000000; | ||
| (A > 0) ? treap.insert(abs(A), priority) : treap.erase(abs(A)); | ||
| cout << treap.kth_largest(k) << endl; | ||
| } | ||
| cout << endl; | ||
| } | ||
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Если делать такую фукнцию, то с параметром, а что собственно делать с элементами?
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Имеется ввиду, чтобы была не просто функция print? Чтобы был обход дерева, а там уже хотим печатаем, хотим еще что-то делаем?
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да. Именно так.