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public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode node = new ListNode(-1);
ListNode tmpNode = node;
while(l1 != null && l2 != null){
if (l1.data > l2.data){
tmpNode.next = l2;
tmpNode = l2;
l2 = l2.next;
}else{
tmpNode.next = l1;
tmpNode = l1;
l1 = l1.next;
}
}
}