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class Solution {

public ListNode mergeTwoLists(ListNode l1, ListNode l2) {

if(l1==null)

{

return l2;

}

if(l2==null)

{

return l1;

}

ListNode head = new ListNode(0);

ListNode result = head;

while(l1!=null&&l2!=null)

{

if(l1.val<=l2.val)

{

result.val = l1.val;

l1 = l1.next;

}

else

{

result.val = l2.val;

l2 = l2.next;

}

ListNode p = new ListNode(0);

result.next = p;

result = p;

}

if(l1!=null)

{

result.val = l1.val;

result.next = l1.next;

}

if(l2!=null)

{

result.val = l2.val;

result.next = l2.next;

}

return head;

}

}