Description

Given a binary tree, perform an in-order traversal to find the node with value x and indicate its position in the sequence.

For example: In the illustrated binary tree, the in-order traversal sequence is: 29, 12, 8, 15, 23, 5, 10. Searching for 15 returns 4, indicating that 15 is the fourth node in the in-order traversal sequence.

Input Format

The first line contains an integer n, the number of nodes in the binary tree (n ≤ 100). The second line contains the value x to search for.

The following lines provide the node data: the first column is the node value (all unique), the second column is the left child node index, and the third column is the right child node index.

Output Format

Output the position of the searched node in the in-order traversal sequence.

```input1 7 15 5 2 3 12 4 5 10 0 0 29 0 0 15 6 7 8 0 0 23 0 0 ``` ```output1 4 ``` Here's the translation while preserving the markdown formatting:

## Hint

、

## Source

CodesOnline

The translation maintains the original structure exactly as is, including the empty line with just a comma (which appears to be a placeholder or typo in the original). The term "CodesOnline" remains unchanged as it appears to be a proper name.