ADD test_rbtree
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/*
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* Copyright (c) 2023 AIIT XUOS Lab
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* XiUOS is licensed under Mulan PSL v2.
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* You can use this software according to the terms and conditions of the Mulan PSL v2.
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* You may obtain a copy of Mulan PSL v2 at:
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* http://license.coscl.org.cn/MulanPSL2
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PSL v2 for more details.
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*/
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/**
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* @file: test_rbtree.c
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* @brief: a application of red-black tree function
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* @version: 1.0
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* @author: 全天星辰-何超
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* @date: 2023/9/23
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*/
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#include<string.h>
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#include <transform.h>
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#include"test_rbtree.h"
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef ADD_XIZI_FEATURES
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// 红黑树节点颜色
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#define RED true
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#define BLACK false
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// 初始化红黑树
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void InitializeRBTree(RBTreeType* tree) {
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tree->root = NULL; // 设置树根为空
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tree->leaf = (RBNodeType*)malloc(sizeof(RBNodeType)); // 分配叶子节点内存
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tree->leaf->is_red = BLACK; // 设置叶子节点为黑色
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tree->leaf->left_child = NULL;
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tree->leaf->right_child = NULL;
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tree->leaf->parent = NULL;
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tree->leaf->key = -1; // 叶子节点的键值设置为特殊值
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}
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// 释放红黑树内存
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void FreeRBTree(RBTreeType* tree, RBNodeType* node) {
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if (node == NULL || node == tree->leaf) {
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return;
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}
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FreeRBTree(tree, node->left_child);
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FreeRBTree(tree, node->right_child);
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free(node);
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}
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// 辅助函数
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static RBNodeType* RBTreeMinimum(RBNodeType* node) {
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while (node->left_child != NULL) {
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node = node->left_child;
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}
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return node;
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}
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static void RBTreeTransplant(RBTreeType* tree, RBNodeType* old_node, RBNodeType* new_node) {
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if (old_node->parent == tree->leaf) {
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tree->root = new_node;
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} else if (old_node == old_node->parent->left_child) {
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old_node->parent->left_child = new_node;
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} else {
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old_node->parent->right_child = new_node;
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}
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if (new_node != NULL) {
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new_node->parent = old_node->parent;
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}
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}
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// 左旋转操作
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static void RBTreeLeftRotate(RBTreeType* tree, RBNodeType* current_node) {
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RBNodeType* right_child = current_node->right_child;
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current_node->right_child = right_child->left_child;
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if (right_child->left_child != tree->leaf) {
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right_child->left_child->parent = current_node;
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}
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right_child->parent = current_node->parent;
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if (current_node->parent == tree->leaf) {
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tree->root = right_child;
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} else if (current_node == current_node->parent->left_child) {
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current_node->parent->left_child = right_child;
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} else {
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current_node->parent->right_child = right_child;
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}
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right_child->left_child = current_node;
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current_node->parent = right_child;
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}
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// 右旋转操作
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static void RBTreeRightRotate(RBTreeType* tree, RBNodeType* current_node) {
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RBNodeType* left_child = current_node->left_child;
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current_node->left_child = left_child->right_child;
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if (left_child->right_child != tree->leaf) {
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left_child->right_child->parent = current_node;
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}
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left_child->parent = current_node->parent;
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if (current_node->parent == tree->leaf) {
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tree->root = left_child;
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} else if (current_node == current_node->parent->right_child) {
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current_node->parent->right_child = left_child;
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} else {
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current_node->parent->left_child = left_child;
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}
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left_child->right_child = current_node;
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current_node->parent = left_child;
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}
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// 插入修复函数
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static void InsertFixup(RBTreeType* tree, RBNodeType* current_node) {
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while (current_node->parent->is_red) {
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if (current_node->parent == current_node->parent->parent->left_child) {
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RBNodeType* uncle = current_node->parent->parent->right_child;
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if (uncle->is_red) {
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current_node->parent->is_red = BLACK;
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uncle->is_red = BLACK;
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current_node->parent->parent->is_red = RED;
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current_node = current_node->parent->parent;
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} else {
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if (current_node == current_node->parent->right_child) {
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current_node = current_node->parent;
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RBTreeLeftRotate(tree, current_node);
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}
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current_node->parent->is_red = BLACK;
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current_node->parent->parent->is_red = RED;
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RBTreeRightRotate(tree, current_node->parent->parent);
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}
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} else {
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// 对称的情况
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RBNodeType* uncle = current_node->parent->parent->left_child;
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if (uncle->is_red) {
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current_node->parent->is_red = BLACK;
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uncle->is_red = BLACK;
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current_node->parent->parent->is_red = RED;
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current_node = current_node->parent->parent;
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} else {
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if (current_node == current_node->parent->left_child) {
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current_node = current_node->parent;
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RBTreeRightRotate(tree, current_node);
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}
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current_node->parent->is_red = BLACK;
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current_node->parent->parent->is_red = RED;
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RBTreeLeftRotate(tree, current_node->parent->parent);
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}
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}
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}
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tree->root->is_red = BLACK;
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}
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// 插入操作
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void RBTreeInsert(RBTreeType* tree, RBNodeType* new_node) {
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RBNodeType* current_node = tree->root;
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RBNodeType* parent_node = tree->leaf;
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// 找到插入位置
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while (current_node != tree->leaf) {
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//printf("dao xun huan fou\n");
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parent_node = current_node;
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if (new_node->key < current_node->key) {
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current_node = current_node->left_child;
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} else {
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current_node = current_node->right_child;
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}
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}
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//printf("chu xun huan fou\n");
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new_node->parent = parent_node;
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if (parent_node == tree->leaf) {
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tree->root = new_node;
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} else if (new_node->key < parent_node->key) {
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parent_node->left_child = new_node;
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} else {
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parent_node->right_child = new_node;
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}
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new_node->left_child = tree->leaf;
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new_node->right_child = tree->leaf;
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new_node->is_red = RED;
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//printf("dao xiu fu fou\n");
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InsertFixup(tree, new_node);
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}
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/*
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// 删除修复函数
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static void DeleteFixup(RBTreeType* tree, RBNodeType* current_node) {
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while (current_node != tree->root && current_node->is_red == BLACK) {
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if (current_node == current_node->parent->left_child) {
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RBNodeType* sibling = current_node->parent->right_child;
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if (sibling->is_red) {
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sibling->is_red = BLACK;
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current_node->parent->is_red = RED;
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RBTreeLeftRotate(tree, current_node->parent);
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sibling = current_node->parent->right_child;
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}
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if (sibling->left_child->is_red == BLACK && sibling->right_child->is_red == BLACK) {
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sibling->is_red = RED;
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current_node = current_node->parent;
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} else {
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if (sibling->right_child->is_red == BLACK) {
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sibling->left_child->is_red = BLACK;
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sibling->is_red = RED;
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RBTreeRightRotate(tree, sibling);
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sibling = current_node->parent->right_child;
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}
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sibling->is_red = current_node->parent->is_red;
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current_node->parent->is_red = BLACK;
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sibling->right_child->is_red = BLACK;
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RBTreeLeftRotate(tree, current_node->parent);
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current_node = tree->root;
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}
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} else {
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// 对称的情况
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RBNodeType* sibling = current_node->parent->left_child;
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if (sibling->is_red) {
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sibling->is_red = BLACK;
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current_node->parent->is_red = RED;
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RBTreeRightRotate(tree, current_node->parent);
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sibling = current_node->parent->left_child;
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}
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if (sibling->right_child->is_red == BLACK && sibling->left_child->is_red == BLACK) {
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sibling->is_red = RED;
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current_node = current_node->parent;
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} else {
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if (sibling->left_child->is_red == BLACK) {
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sibling->right_child->is_red = BLACK;
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sibling->is_red = RED;
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RBTreeLeftRotate(tree, sibling);
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sibling = current_node->parent->left_child;
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}
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sibling->is_red = current_node->parent->is_red;
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current_node->parent->is_red = BLACK;
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sibling->left_child->is_red = BLACK;
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RBTreeRightRotate(tree, current_node->parent);
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current_node = tree->root;
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}
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}
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}
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current_node->is_red = BLACK;
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}
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// 删除节点
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void RBTreeDelete(RBTreeType* tree, RBNodeType* target_node) {
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RBNodeType* current_node = target_node;
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RBNodeType* temp_node;
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bool original_color = current_node->is_red;
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if (target_node->left_child == tree->leaf) {
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temp_node = target_node->right_child;
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RBTreeTransplant(tree, target_node, target_node->right_child);
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} else if (target_node->right_child == tree->leaf) {
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temp_node = target_node->left_child;
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RBTreeTransplant(tree, target_node, target_node->left_child);
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} else {
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current_node = RBTreeMinimum(target_node->right_child);
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original_color = current_node->is_red;
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temp_node = current_node->right_child;
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if (current_node->parent == target_node) {
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temp_node->parent = current_node;
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} else {
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RBTreeTransplant(tree, current_node, current_node->right_child);
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current_node->right_child = target_node->right_child;
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current_node->right_child->parent = current_node;
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}
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RBTreeTransplant(tree, target_node, current_node);
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current_node->left_child = target_node->left_child;
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current_node->left_child->parent = current_node;
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current_node->is_red = target_node->is_red;
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}
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if (original_color == BLACK) {
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DeleteFixup(tree, temp_node);
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}
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free(target_node);
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}
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*/
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void DeleteFixup(RBTreeType *tree, RBNodeType* current_node)
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{
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while ((current_node != tree->root) && (current_node->is_red == false)){
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if (current_node == current_node->parent->left_child){
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RBNodeType* brother_node = current_node->parent->right_child;
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if (brother_node->is_red){
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brother_node->is_red = false;
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current_node->parent->is_red = true;
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RBTreeLeftRotate(tree, current_node->parent);
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brother_node = current_node->parent->right_child;
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}
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if ((brother_node->left_child->is_red == false) && (brother_node->right_child->is_red == false)){
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brother_node->is_red = true;
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current_node = current_node->parent;
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}else{
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if (brother_node->right_child->is_red == false){
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brother_node->left_child->is_red = false;
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brother_node->is_red = true;
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RBTreeRightRotate(tree, brother_node);
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brother_node = current_node->parent->right_child;
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}
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brother_node->is_red = current_node->parent->is_red;
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current_node->parent->is_red = false;
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brother_node->right_child->is_red = false;
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RBTreeLeftRotate(tree, current_node->parent);
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current_node = tree->root;
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}
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}else{
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RBNodeType* brother_node = current_node->parent->left_child;
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if (brother_node->is_red){
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brother_node->is_red = false;
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current_node->parent->is_red = true;
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RBTreeRightRotate(tree, current_node->parent);
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brother_node = current_node->parent->left_child;
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}
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if ((brother_node->left_child->is_red == false) && (brother_node->right_child->is_red == false)){
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brother_node->is_red = true;
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current_node = current_node->parent;
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}else{
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if (brother_node->left_child->is_red == false){
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brother_node->right_child->is_red = false;
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brother_node->is_red = true;
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RBTreeLeftRotate(tree, brother_node);
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brother_node = current_node->parent->left_child;
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}
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brother_node->is_red = current_node->parent->is_red;
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current_node->parent->is_red = false;
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brother_node->left_child->is_red = false;
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RBTreeRightRotate(tree, current_node->parent);
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current_node = tree->root;
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}
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}
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}
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current_node->is_red = false;
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}
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void RBTreeDelete(RBTreeType *tree, RBNodeType* target_node)
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{
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RBNodeType* delete_node = tree->leaf;
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RBNodeType* replace_node = tree->leaf;
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if ((target_node->left_child == tree->leaf) || (target_node->right_child == tree->leaf))
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delete_node = target_node;
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else
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delete_node = FindSuccessor(tree, target_node);
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if (delete_node->left_child != tree->leaf) /* successor still has subtree */
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replace_node = delete_node->left_child;
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else if (delete_node->right_child != tree->leaf)
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replace_node = delete_node->right_child;
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replace_node->parent = delete_node->parent;
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if (delete_node->parent == tree->leaf) /* delete a root node */
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tree->root = replace_node;
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else if (delete_node == delete_node->parent->left_child)
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delete_node->parent->left_child = replace_node;
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else
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delete_node->parent->right_child = replace_node;
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if (delete_node != target_node)
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target_node->key = delete_node->key;
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if (delete_node->is_red == false)
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DeleteFixup(tree, replace_node);
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free(delete_node);
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}
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/*
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// 查找后继节点
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RBNodeType* FindSuccessor(RBTreeType* tree, RBNodeType* current_node) {
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if (current_node->right_child != tree->leaf) {
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return RBTreeMinimum(current_node->right_child);
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}
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RBNodeType* parent_node = current_node->parent;
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while (parent_node != tree->leaf && current_node == parent_node->right_child) {
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current_node = parent_node;
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parent_node = parent_node->parent;
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}
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return parent_node;
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}
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*/
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RBNodeType* FindSuccessor(RBTreeType *tree, RBNodeType* current_node)
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{
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RBNodeType* parent_node = current_node->parent;
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if (current_node->right_child != tree->leaf){
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current_node = current_node->right_child;
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while (current_node->left_child != tree->leaf)
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current_node = current_node->left_child;
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return current_node;
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}
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while ((parent_node != tree->leaf) && (current_node == parent_node->right_child)){
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current_node = parent_node;
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parent_node = parent_node->parent;
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}
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return parent_node;
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}
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// 中序遍历红黑树
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static void RBTreeInorderTraversal(RBTreeType* tree, RBNodeType* node) {
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if (node != tree->leaf) {
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RBTreeInorderTraversal(tree, node->left_child);
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printf("%d(%s) ", node->key, node->is_red ? "RED" : "BLACK");
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RBTreeInorderTraversal(tree, node->right_child);
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}
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}
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// 对外提供的遍历接口
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void RBTreeTraversal(RBTreeType* tree) {
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RBTreeInorderTraversal(tree, tree->root);
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printf("\n");
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}
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// 在红黑树中查找指定键值的节点
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RBNodeType* RBTreeSearch(RBTreeType* tree, int key) {
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RBNodeType* current_node = tree->root;
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while (current_node != tree->leaf) {
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if (key == current_node->key) {
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return current_node;
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} else if (key < current_node->key) {
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current_node = current_node->left_child;
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} else {
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current_node = current_node->right_child;
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}
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}
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return NULL;
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}
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/*
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// 测试函数
|
||||
void TestRBTree(void) {
|
||||
RBTreeType tree;
|
||||
InitializeRBTree(&tree); // 初始化红黑树
|
||||
int keys[] = {50, 30, 70, 20, 40, 60, 80, 10, 25, 35, 45, 55, 65, 75, 90, 5, 15, 28, 38, 48};
|
||||
|
||||
for (int i = 0; i < sizeof(keys) / sizeof(keys[0]); i++) {
|
||||
RBNodeType* new_node = (RBNodeType*)malloc(sizeof(RBNodeType));
|
||||
if (new_node == NULL) {
|
||||
// 处理内存分配失败的情况
|
||||
fprintf(stderr, "Error: Memory allocation failed.\n");
|
||||
}
|
||||
new_node->left_child = NULL;
|
||||
new_node->right_child = NULL;
|
||||
new_node->parent = NULL;
|
||||
new_node->is_red = true;
|
||||
new_node->key = keys[i];
|
||||
printf("charuqian\n ");
|
||||
RBTreeInsert(&tree, new_node);
|
||||
}
|
||||
|
||||
printf("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\n ");
|
||||
printf("Inorder Traversal: ");
|
||||
RBTreeTraversal(&tree);
|
||||
|
||||
printf("Enter key to search and delete (Ctrl+C to exit):\n");
|
||||
int key;
|
||||
while (1) {
|
||||
printf("Enter key: ");
|
||||
if (scanf("%d", &key) != 1) {
|
||||
printf("Invalid input. Please enter a valid integer.\n");
|
||||
continue;
|
||||
}
|
||||
|
||||
RBNodeType* found_node = RBTreeSearch(&tree, key);
|
||||
if (found_node != NULL) {
|
||||
printf("Key %d found. Parent: %d, Left: %d, Right: %d\n", key,
|
||||
found_node->parent != NULL ? found_node->parent->key : -1,
|
||||
found_node->left_child != NULL ? found_node->left_child->key : -1,
|
||||
found_node->right_child != NULL ? found_node->right_child->key : -1);
|
||||
RBTreeDelete(&tree, found_node);
|
||||
printf("Key %d deleted\n", key);
|
||||
printf("Inorder Traversal: ");
|
||||
RBTreeTraversal(&tree);
|
||||
} else {
|
||||
printf("Key %d not found\n", key);
|
||||
}
|
||||
}
|
||||
|
||||
// 释放红黑树内存
|
||||
FreeRBTree(&tree, tree.root);
|
||||
free(tree.leaf);
|
||||
}
|
||||
*/
|
||||
void TestRBTree(void)
|
||||
{
|
||||
int default_key[] = {50, 30, 70, 20, 40, 60, 80, 10, 25, 35, 45, 55, 65, 75, 90, 5, 15, 28, 38, 48};
|
||||
int array_size = sizeof(default_key) / sizeof(default_key[0]);
|
||||
|
||||
printf("Test Red Black Tree\n");
|
||||
printf("default_key array: ");
|
||||
for (int i = 0; i < array_size; i++)
|
||||
printf("%d ", default_key[i]);
|
||||
printf("\n%d elements\n", array_size);
|
||||
|
||||
RBTreeType *tree = (RBTreeType *)malloc(sizeof(RBTreeType));
|
||||
if (tree == NULL) {
|
||||
printf("malloc failed\n");
|
||||
return;
|
||||
}
|
||||
|
||||
tree->leaf = (RBNodeType*)malloc(sizeof(RBNodeType));
|
||||
tree->leaf->left_child = NULL;
|
||||
tree->leaf->right_child = NULL;
|
||||
tree->leaf->parent = NULL;
|
||||
tree->leaf->is_red = false;
|
||||
tree->leaf->key = -1;
|
||||
tree->root = tree->leaf;
|
||||
|
||||
RBNodeType *node = tree->leaf;
|
||||
|
||||
for (int i = 0; i < array_size; i++) {
|
||||
node = (RBNodeType*)malloc(sizeof(RBNodeType));
|
||||
node->left_child = tree->leaf;
|
||||
node->right_child = tree->leaf;
|
||||
node->parent = NULL;
|
||||
node->is_red = true;
|
||||
node->key = default_key[i];
|
||||
printf("insert key[%d]=%d\n",i,default_key[i]);
|
||||
RBTreeInsert(tree, node);
|
||||
}
|
||||
|
||||
printf("Inorder Traversal: ");
|
||||
RBTreeTraversal(tree);
|
||||
int key;
|
||||
while (1) {
|
||||
printf("Enter key: ");
|
||||
if (scanf("%d", &key) != 1) {
|
||||
printf("Invalid input. Please enter a valid integer.\n");
|
||||
continue;
|
||||
}
|
||||
if (key==-1||tree==NULL)
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
RBNodeType* found_node = RBTreeSearch(tree, key);
|
||||
if (found_node != NULL) {
|
||||
printf("Key %d found. Parent: %d, Left: %d, Right: %d\n", key,
|
||||
found_node->parent != NULL ? found_node->parent->key : -1,
|
||||
found_node->left_child != NULL ? found_node->left_child->key : -1,
|
||||
found_node->right_child != NULL ? found_node->right_child->key : -1);
|
||||
RBTreeDelete(tree, found_node);
|
||||
printf("Key %d deleted\n", key);
|
||||
printf("Inorder Traversal: ");
|
||||
RBTreeTraversal(tree);
|
||||
} else {
|
||||
printf("Key %d not found\n", key);
|
||||
}
|
||||
}
|
||||
// 释放红黑树内存
|
||||
FreeRBTree(tree, tree->root);
|
||||
free(tree->leaf);
|
||||
}
|
||||
|
||||
PRIV_SHELL_CMD_FUNCTION(TestRBTree, a red-black tree test sample, PRIV_SHELL_CMD_MAIN_ATTR);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue