Estudos de árvores binárias e introdução à tabela hash com listas

EDA/binary_tree.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+// Binary tree implementation with linked list
+typedef struct treenode {
+    int data;
+    struct treenode *left, *right;
+} treenode;
+
+// function to create a new root
+treenode *createnode(int data) {
+
+    // Alloc a new space in memory to root
+    treenode *new = malloc(sizeof(treenode));
+    new->left = NULL;
+    new->right = NULL;
+    new->data = data;
+
+    return new;
+
+}
+
+// Inserting elements in a binary tree
+treenode *insert_node(treenode *node, int data) {
+
+    // Checking if the tree is empty
+    if(node == NULL) return createnode(data);
+
+    // If isn't empty, now check if de data is lesser than root
+    if(data < node->data)
+        node->left = insert_node(node->left, data);
+    // If isn't empty. now check if de data is greater than root
+    else if(data > node->data)
+        node->right = insert_node(node->right, data);
+
+    // Return the node with the new leaf
+    return node;
+
+}
+
+// Printing elements in a tree pre-order
+void print_tree(treenode *node) {
+
+    if(node != NULL) {
+
+        printf("%d\n", node->data);
+        print_tree(node->left);
+        print_tree(node->right);
+
+    }
+
+}
+
+// Searching elements in a tree
+treenode *search_tree(treenode *node, int value) {
+
+    // If not found the value
+    if(node == NULL) return NULL;
+
+    // If found the value 
+    if (value == node->data)
+        return node;
+
+    // Same logic in printing, we search for values lesser or higher
+    else if(value < node->data)
+        return search_tree(node->left, value);
+    else if (value > node->data)
+        return search_tree(node->right, value);
+
+}
+
+// founding the min value (aux to delete_tree)
+treenode *find_min(treenode *node) {
+
+    while(node->left != NULL)
+        node = node->left;
+
+    return node;
+
+}
+
+// Deleting a given node value
+treenode *delete_tree(treenode *node, int value) {
+
+    // End of recursion or empty tree
+    if(node == NULL) return node;
+
+    // Choosing the direction to found the value to be deleted
+    if(value < node->data)
+        node->left = delete_tree(node->left, value);
+    else if(value > node->data)
+        node->right = delete_tree(node->right,value);
+
+    else {
+        // case 1 and 2, if the node has 0 or 1 child
+        if(node->left == NULL) {
+            treenode *temp = node->right;
+            free(node);
+            return temp;
+        } else if (node->right == NULL) {
+            treenode *temp = node->left;
+            free(node);
+            return temp;
+        }
+
+        // Third case: If the node has two children, we've to found the lesser
+        treenode *temp = find_min(node->right);
+
+        //copy the content of the sucessor for te actual node
+        node->data = temp->data;
+
+        // Now, delete de sucessor
+        node->right = delete_tree(node->right, temp->data);    
+
+    }
+
+    return node;
+
+}
+
+// Example using each function 
+
+/*
+int main(void) {
+
+    treenode *n1 = createnode(10);
+    insert_node(n1, 8);
+    insert_node(n1, 6);
+    insert_node(n1, 9);
+    insert_node(n1, 12);
+    insert_node(n1, 11);
+    insert_node(n1, 13);
+
+    print_tree(n1);
+
+    if(search_tree(n1,13))
+        printf("Found\n");
+
+    delete_tree(n1,10);
+
+    print_tree(n1);
+
+}
+*/
+
+
+

EDA/hash.c

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+#include <stdlib.h>
+#include <stdio.h>
+
+/*
+    To program a hash Table with chaining, we've to create
+    the basic linked list functions
+
+    but the insertion has to bem sorted
+
+*/
+
+typedef struct node {
+    int data;
+    struct node *next;
+} node;
+
+
+// Sorted insertion and creation of linked list 
+void sorted_insert(node *node, int x) {
+
+    struct node *temp = node, *q = NULL, *new;
+    new = malloc(sizeof(node));
+    new->data = x;
+    new->next = NULL;
+
+    if(node == NULL)
+        node = new;
+    else {
+        while(temp && temp->data < x){
+            q=temp;
+            temp=temp->next;
+        }
+        if(temp == node){
+            new->next = node;
+            node = new;
+        }
+        else{
+            new->next=q->next;
+            q->next=new;
+        }
+    }
+
+}
+
+// Searching in linked list
+node *search(node *node, int key) {
+
+    while (node != NULL) {
+        if(key == node->data)
+            return node;
+        node=node->next;
+    }
+
+    return NULL;
+
+}
+
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