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.
Solution:O(n)
public class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode p1 = l1;
ListNode p2 = l2;
ListNode dummy= new ListNode(0);
ListNode p = dummy;
while(p1 != null && p2 != null){
if(p1.val <= p2.val){
p.next = p1;
p1 = p1.next;
}else{
p.next = p2;
p2 = p2.next;
}
p = p.next;
}
if(p1 != null)
p.next = p1;
if(p2 != null)
p.next = p2;
return dummy.next;
}
}
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