Program to merge two sorted linked list in C#.

In this article, we will discuss how to merge two sorted linked list.

This is a frequently asked interview question. This can be solved by comparing each node of first list with second one and inserting nodes from second to first where ever there is a need.

public void MergeSortedList(Node first, Node second) {   
    //we would be adding node from second list to first list   
    //If second node data id more than first one then exchange it   
    if(first.data.ToString().compareto(second.data.ToString()) > 0)   
    {    
        node t = first;    
        first = second;    
        second = first;   
     } 
head = first;//Assign head to first Node  

while ((first.next != null ) && (second != null)) {      
    if (Convert.ToInt32( first.next.data.ToString())) < Convert.ToInt32(first.data.ToString()))      
    {      
    first = first.next;//iterate over the first node      
    }      
    else      
    {      
    Node n = first.next;      
    Node t = second.next;      
    first.next = second;      
    second.next = n;      
    first = first.next;      
    second = t;      
    } 
} 
if (first.next = null)     
{     
    first.next =  second;     
    }  
 } 

Source: Csharpstar

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