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Merge Two Sorted Lists

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;
    }
}



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