Merge two sorted linked lists and return it as a sorted list. The list should be made by splicing together the nodes of the first two lists.
Example 1:
Input: l1 = [1,2,4], l2 = [1,3,4]
Output: [1,1,2,3,4,4]
Example 2:
Input: l1 = [], l2 = []
Output: []
Example 3:
Input: l1 = [], l2 = [0]
Output: [0]
Constraints:
The number of nodes in both lists is in the range [0, 50].
-100 <= Node.val <= 100
Both l1 and l2 are sorted in non-decreasing order.
Solution:
class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode resultHead = new ListNode(0);
ListNode result = resultHead;
while(l1!=null && l2!=null)
{
if(l1.val<=l2.val)
{
result.next= l1;
l1=l1.next;
}
else
{
result.next = l2;
l2 = l2.next;
}
result = result.next;
}
result.next = l1 != null ? l1 : l2;
return resultHead.next;
}
}