Level Order Traversal of a Binary Tree - Iteration - Visualization
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TS
#include <stdio.h>
#include <stdlib.h>
#define MAX_QUEUE_SIZE 100
typedef struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
} TreeNode;
TreeNode* createNode(int val) {
TreeNode* node = (TreeNode*)malloc(sizeof(TreeNode));
node->val = val;
node->left = node->right = NULL;
return node;
}
int* levelOrderTraversal(TreeNode* root, int* returnSize) {
if (!root) {
*returnSize = 0;
return NULL;
}
TreeNode* queue[MAX_QUEUE_SIZE];
int front = 0, rear = 0;
int* result = malloc(MAX_QUEUE_SIZE * sizeof(int));
int count = 0;
queue[rear++] = root;
while (front < rear) {
TreeNode* node = queue[front++];
result[count++] = node->val;
if (node->left) queue[rear++] = node->left;
if (node->right) queue[rear++] = node->right;
}
*returnSize = count;
return result;
}
int main() {
TreeNode* root = createNode(1);
root->left = createNode(2);
root->right = createNode(3);
root->left->left = createNode(4);
root->left->right = createNode(5);
int returnSize;
int* res = levelOrderTraversal(root, &returnSize);
printf("Level order traversal: ");
for (int i = 0; i < returnSize; i++) {
printf("%d ", res[i]);
}
printf("\n");
free(res);
return 0;
}
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