136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#define MAX 100
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typedef struct TNode *Tptr;
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typedef struct TNode {
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int data;
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Tptr leftchild;
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Tptr rightchild;
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} TNode;
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typedef struct {
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Tptr key;
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} element;
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element Q[MAX];
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int r = -1;
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int f = -1;
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element dequeue() {
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element ret = {NULL};
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if (f != r) {
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f++;
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ret = Q[f];
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}
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return ret;
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}
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void enqueue(element e) {
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if (r < MAX - 1) { // Check if the queue is not full
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r++;
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Q[r] = e;
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} else {
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printf("Queue is full\n");
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}
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}
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// Create nodes in the tree
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Tptr createNode(int val) {
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Tptr temp = (Tptr)malloc(sizeof(TNode));
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if (temp) {
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temp->data = val;
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temp->leftchild = temp->rightchild = NULL;
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}
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return temp;
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}
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// Create the binary search tree
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void createBST(Tptr *root) {
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int N, i, val;
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Tptr current, previous;
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printf("Enter the number of nodes: ");
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scanf("%d", &N);
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for (i = 0; i < N; i++) {
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printf("Enter a unique value: ");
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scanf("%d", &val);
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Tptr temp = createNode(val);
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if (!temp) {
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printf("Memory allocation failed\n");
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return;
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}
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if (!*root) {
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*root = temp;
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} else {
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current = *root;
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previous = NULL;
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int isDuplicate = 0; // Flag for duplicate
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while (current) {
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previous = current;
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if (val < current->data) {
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current = current->leftchild;
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} else if (val > current->data) {
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current = current->rightchild;
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} else {
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printf("Duplicate. Will only be printed for first occurence.\n");
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isDuplicate = 1; // Set flag if duplicate found
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break; // Exit loop
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}
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}
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if (!isDuplicate) {
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if (val < previous->data) {
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previous->leftchild = temp;
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} else {
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previous->rightchild = temp;
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}
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} else {
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free(temp); // Free memory for duplicate node
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}
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}
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}
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}
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// Print in level order
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void levelOrderTraversal(Tptr current) {
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if (current == NULL) {
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return;
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}
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element b;
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b.key = current;
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enqueue(b);
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while (f != r) { // While the queue is not empty
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Tptr currentNode = dequeue().key;
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printf("%d ", currentNode->data);
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if (currentNode->leftchild != NULL) {
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b.key = currentNode->leftchild;
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enqueue(b);
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}
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if (currentNode->rightchild != NULL) {
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b.key = currentNode->rightchild;
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enqueue(b);
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}
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}
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}
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int main() {
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Tptr root = NULL;
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createBST(&root);
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printf("Level Order Traversal: ");
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levelOrderTraversal(root);
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printf("\n");
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return 0;
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}
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