class Solution {
public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
ListNode dummy = new ListNode(0);
ListNode l3 = dummy;
while (l1 != null && l2 != null) {
if (l1.val <= l2.val) {
l3.next = l1;
l1 = l1.next;
} else {
l3.next = l2;
l2 = l2.next;
}
l3 = l3.next;
}
if (l1 != null) {
l3.next = l1;
}
if (l2 != null) {
l3.next = l2;
}
return dummy.next;
}
}
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