Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.
Example:
Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4->4
Java Solution :
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode node = new ListNode(-1);
ListNode head = node;
while(l1 != null && l2 !=null){
if(l1.val < l2.val){
node.next = l1;
l1 = l1.next;
}else {
node.next = l2;
l2 = l2.next;
}
node = node.next;
}
if(l1 !=null){
node.next = l1;
}else if(l2 != null){
node.next = l2;
}
return head.next;
}
}