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//
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// Created by 423A35C7 on 2023-12-15.
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//
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// 09:19
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// 20:06
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#include <algorithm>
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#include <cassert>
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#include <functional>
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#include <iostream>
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#include <memory>
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#include <vector>
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template<typename T> |
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class BiSortNode { |
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public: |
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using NodePtr = std::unique_ptr<BiSortNode>; |
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// 好像这里没法使用initializer_list,initializer_list是对于多个相同值的初始化,而不是一个东西的初始化参数列表
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template<typename... Args> |
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explicit BiSortNode(Args... args, std::function<bool(T, T)> _compare) : data(args...) { |
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this->compare_function_(_compare); |
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} |
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template<typename... Args> |
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explicit BiSortNode(Args... args) : data(args...) { |
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this->compare_function_ = [](T&a, T&b) { return a < b; }; |
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} |
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void update_depth_and_balance_factor() { |
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const int left_depth = this->left_child ? this->left_child->depth + 1 : 0; |
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const int right_depth = this->right_child ? this->right_child->depth + 1 : 0; |
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this->balance_factor = left_depth - right_depth; |
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this->depth = std::max(left_depth, right_depth); |
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} |
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// 这里的左旋指的是LL型需要进行的旋转,名称不一定对
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// 这部分用注释不好解释,建议最好搜一下网上的图解,理解了之后再看这部分代码
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static void left_rotate(NodePtr&unbalanced) { |
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NodePtr pivot = std::move(unbalanced->left_child); |
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unbalanced->left_child = std::move(pivot->right_child); |
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pivot->right_child = std::move(unbalanced); |
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unbalanced = std::move(pivot); |
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unbalanced->update_depth_and_balance_factor(); |
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unbalanced->right_child->update_depth_and_balance_factor(); |
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} |
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// 这里的右旋指的是RR型需要进行的旋转,名称不一定对
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// 这部分用注释不好解释,建议最好搜一下网上的图解,理解了之后再看这部分代码
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static void right_rotate(NodePtr&unbalanced) { |
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NodePtr pivot = std::move(unbalanced->right_child); |
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unbalanced->right_child = std::move(pivot->left_child); |
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pivot->left_child = std::move(unbalanced); |
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unbalanced = std::move(pivot); |
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unbalanced->update_depth_and_balance_factor(); |
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unbalanced->left_child->update_depth_and_balance_factor(); |
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} |
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static void insert(NodePtr¤t_node, T new_data) { |
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// int balance_diff = 0;
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if (new_data < current_node->data) { |
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// 如果新的节点比当前节点小就找它的左子树
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if (current_node->left_child == nullptr) { |
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current_node->left_child = std::make_unique<BiSortNode>(new_data); |
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} |
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else { |
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current_node->insert(current_node->left_child, new_data); |
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} |
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} |
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else { |
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// 否则找右子树
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if (current_node->right_child == nullptr) { |
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current_node->right_child = std::make_unique<BiSortNode>(new_data); |
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} |
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else { |
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current_node->insert(current_node->right_child, new_data); |
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} |
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} |
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current_node->update_depth_and_balance_factor(); |
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if (current_node->balance_factor > 1) { |
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// 左子树比右子树高
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assert(current_node->left_child->balance_factor != 0); // 此时左子树的平衡因子不应为0
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if (current_node->left_child->balance_factor < 0) // 符合LR型
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current_node->right_rotate(current_node->left_child); // 先进行右旋(逆时针),转化为LL
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current_node->left_rotate(current_node); // 左旋(顺时针)
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} |
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else if (current_node->balance_factor < -1) { |
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// 右子树比左子树高
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assert(current_node->right_child->balance_factor != 0); // 此时右子树的平衡因子不应为0
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if (current_node->right_child->balance_factor > 0) // 符合RL型
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current_node->left_rotate(current_node->right_child); // 先进行左旋(顺时针),转化为RR型
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current_node->right_rotate(current_node); // 右旋(逆时针)
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} |
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// current_node->balance_factor += balance_diff;
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current_node->update_depth_and_balance_factor(); |
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// return balance_diff;
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} |
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void inorder_traversal(std::vector<T>&output) { |
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if (this->left_child != nullptr) this->left_child->inorder_traversal(output); |
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output.push_back(this->data); |
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if (this->right_child != nullptr) this->right_child->inorder_traversal(output); |
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} |
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void preorder_traversal(std::vector<T>&output) { |
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output.push_back(this->data); |
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if (this->left_child != nullptr) this->left_child->preorder_traversal(output); |
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if (this->right_child != nullptr) this->right_child->preorder_traversal(output); |
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} |
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void postorder_traversal(std::vector<T>&output) { |
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if (this->left_child != nullptr) this->left_child->postorder_traversal(output); |
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if (this->right_child != nullptr) this->right_child->postorder_traversal(output); |
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output.push_back(this->data); |
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} |
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void traverse_and_output(std::ostream&out, std::function<void(std::vector<T>&)> traverse_function) { |
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std::vector<T> traverse_result; |
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traverse_function(traverse_result); |
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for (auto const&i: traverse_result) |
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std::cout << i << " "; |
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std::cout << std::endl; |
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} |
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private: |
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NodePtr left_child; |
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NodePtr right_child; |
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int balance_factor = 0; // 平衡因子
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int depth = 0; // 树的深度(高度)
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T data; |
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std::function<bool(T&, T&)> compare_function_; |
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}; |
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int main() { |
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std::vector<int> origin_vector; |
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int temp; |
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while (std::cin >> temp) { |
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origin_vector.push_back(temp); |
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} |
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auto generator = origin_vector.cbegin(); |
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BiSortNode<int>::NodePtr bi_sort_node{new BiSortNode<int>(*generator++)}; |
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while (generator != origin_vector.cend()) { |
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bi_sort_node->insert(bi_sort_node, *generator++); |
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} |
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std::vector<int> traversal_result; |
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bi_sort_node->inorder_traversal(traversal_result); |
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std::cout << "为了便于验证,以下依次输出平衡二叉树的前序、中序、后序遍历结果:" << std::endl; |
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bi_sort_node->traverse_and_output(std::cout, [&bi_sort_node](std::vector<int>&output) { |
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bi_sort_node->preorder_traversal(output); |
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}); |
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bi_sort_node->traverse_and_output(std::cout, [&bi_sort_node](std::vector<int>&output) { |
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bi_sort_node->inorder_traversal(output); |
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}); |
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bi_sort_node->traverse_and_output(std::cout, [&bi_sort_node](std::vector<int>&output) { |
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bi_sort_node->postorder_traversal(output); |
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}); |
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return 0; |
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} |
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// 输入:
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// 98 77 94 67 59 60 56 68 95 98 32 39 32 17 5 5 8 19 40 41
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// 输出:
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// 为了便于验证,以下依次输出平衡二叉树的前序、中序、后序遍历结果:
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// 67 39 17 5 5 8 32 19 32 59 41 40 56 60 94 77 68 98 95 98
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// 5 5 8 17 19 32 32 39 40 41 56 59 60 67 68 77 94 95 98 98
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// 5 8 5 19 32 32 17 40 56 41 60 59 39 68 77 95 98 98 94 67
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