> For the complete documentation index, see [llms.txt](https://mayanktyagi3111.gitbook.io/interview-prep/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mayanktyagi3111.gitbook.io/interview-prep/trees/next-greater-number-bst.md).

# Next Greater Number BST

Given a BST node, return the node which has value just greater than the given node.

**Example:**

Given the tree

```
               100
              /   \
            98    102
           /  \
         96    99
          \
           97
```

Given `97`, you should return the node corresponding to `98` as thats the value just greater than `97` in the tree.\
If there are no successor in the tree ( the value is the largest in the tree, return `NULL`).

**Using recursion is not allowed.**

Assume that the value is always present in the tree.

```java
public class Solution {
    public TreeNode getSuccessor(TreeNode a, int b) {
        TreeNode ans = null;
        while (a != null) {
            if (a.val > b) {
                ans = a;
                a = a.left;
            } else {
                a = a.right;
            }
        }
        return ans;
    }
}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://mayanktyagi3111.gitbook.io/interview-prep/trees/next-greater-number-bst.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.