21. Merge Two Sorted Lists

leetcode.com/problems/merge-two-sorted-lists/

Merge Two Sorted Lists - LeetCode

class Solution {
    
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        ListNode ret = null;
        
        if(l1 == null) return l2;
        if(l2 == null) return l1;
        
        if(l1.val < l2.val) {
            
            l1.next = mergeTwoLists(l1.next, l2);
            return l1;
        } else {
            l2.next = mergeTwoLists(l1, l2.next);
            return l2;
        }
    }
}