96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
#include <string.h>
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#include "stack.h"
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#include "bintree.h"
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//TODO: binären Suchbaum implementieren
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/* * `addToTree`: fügt ein neues Element in den Baum ein (rekursiv),
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* `clearTree`: gibt den gesamten Baum frei (rekursiv),
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* `treeSize`: zählt die Knoten im Baum (rekursiv),
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* `nextTreeData`: Traversierung mit Hilfe des zuvor implementierten Stacks. */
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// Adds a copy of data's pointer destination to the tree using compareFct for ordering. Accepts duplicates
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// if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
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TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
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{
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if(root == NULL){
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//Allocate Memory for Node
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TreeNode *newNode = calloc(1, sizeof(TreeNode));
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if(newNode == NULL){
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return NULL; //Memory allocation failed
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}
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//Allocate Memory for data
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newNode->data = malloc(dataSize);
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if(newNode->data == NULL){
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free(newNode); //Free unused Memory
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return NULL;; //Memory allocation failed
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}
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memcpy(newNode->data, data, dataSize); //Copy Data
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newNode->left = NULL;
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newNode->right = NULL;
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if(isDuplicate != NULL){
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*isDuplicate = 0;
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}
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return newNode;
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}
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int cmp = compareFct(root->data, data);
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if(cmp == 0){
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//Duplicate
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if(isDuplicate != NULL){
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//Ignore duplicate
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*isDuplicate = 1;
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return root;
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} else{
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//Accept duplicate
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root->right = addToTree(root->right, data, dataSize, compareFct, NULL);
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}
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}
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else if (cmp > 0)
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{
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//Data is smaller -> left
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root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
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}else{
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//Data is bigger -> right
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root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
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}
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return root;
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}
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// Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.
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// Use your implementation of a stack to organize the iterator. Push the root node and all left nodes first. On returning the next element,
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// push the top node and push all its left nodes.
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void *nextTreeData(TreeNode *root)
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{
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}
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// Releases all memory resources (including data copies).
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void clearTree(TreeNode *root)
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{
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if(root == NULL){
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return;
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}
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clearTree(root->left);
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clearTree(root->right);
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free(root->data);
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free(root);
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}
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// Returns the number of entries in the tree given by root.
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unsigned int treeSize(const TreeNode *root)
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{
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if(root == NULL){
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return 0;
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}
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return 1 + treeSize(root->left) + treeSize(root->right);
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} |