Invert Binary Tree

Write a function to invert a binary tree. Inverting a binary tree means swapping the left and right child of all nodes in the tree. The input will be given in level order. Input format: - The first line contains an integer N, the number of nodes in the binary tree. - The next N lines describe the nodes in level order where -1 indicates a null node. Output format: - Print the inverted tree nodes in level order with space-separated values. Use -1 for null nodes. Example: Input: 5 1 2 3 -1 -1 4 5 Output: 1 3 2 5 4 -1 -1