/**
* 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 p = l1,q = l2;
ListNode res = null;
if(l1==null)return l2;
if(l2==null)return l1;
if(p.val<=q.val){
res = p;
p = p.next;
}else{
res = q;
q = q.next;
}
ListNode cur = res;
while(p!=null&&q!=null){
if(p.val<=q.val){
cur.next = p;
cur = cur.next;
p=p.next;
}else{
cur.next = q;
cur = cur.next;
q=q.next;
}
}
if(p==null)cur.next = q;
if(q==null)cur.next = p;
return res;
}
}
21. Merge Two Sorted Lists
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