> For the complete documentation index, see [llms.txt](https://nitinranganath.gitbook.io/data-structures/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nitinranganath.gitbook.io/data-structures/linked-list/merge-two-sorted-lists.md).

# Merge Two Sorted Lists

```c
void merge(struct node *first, struct node *second) {

    // A pointer to keep track of last node of merged list
    struct node *last;
    
    // First node of merged list
    if (first -> data < second -> data) {
        // Set head and tail of merged list
        third = last = first;
        // Move forward in first list
        first = first -> next;
    } else {
        // Set head and tail of merged list
        third = last = second;
        // Move forward in second list
        second = second -> next;
    }
    third -> next = NULL;
    
    // Remaining node of merged list
    while (first && second) {
        if(first -> data < second -> data) {
            // Next node will be first's node
            last -> next = first;
            // Update the last pointer
            last = first;
            first = first -> next;
        } else {
            // Next node will be second's node
            last -> next = second;
            // Update the last pointer
            last = second;
            second = second -> next;
        }
    }
    
    // Merging remaining elements of first list (if any)
    if (first) {
        last -> next = first;
    }
    
    // Merging remaining elements of second list (if any)
    if (second) {
        last -> next  = second;
    }

}
```

Contributed by Nitin Ranganath


---

# 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://nitinranganath.gitbook.io/data-structures/linked-list/merge-two-sorted-lists.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.