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import java.lang.*;
import java.util.*;
import node.*;
class MergeLists {
public static ListNode mergeTwoLists(ListNode list1, ListNode list2) {
if (list1 == null && list2 == null)
return new ListNode();
else if (list1 == null)
return list2;
else if (list2 == null)
return list1;
ListNode curr1 = list1;
ListNode curr2 = list2;
ListNode head;
if (curr1.val < curr2.val) {
head = curr1;
curr1 = curr1.next;
} else {
head = curr2;
curr2 = curr2.next;
}
ListNode node = head;
while (curr1 != null && curr2 != null) {
if (curr1.val < curr2.val) {
node.next = curr1;
curr1 = curr1.next;
} else {
node.next = curr2;
curr2 = curr2.next;
}
node = node.next;
}
if (curr1 == null) {
node.next = curr2;
} else {
node.next = curr1;
}
return head;
}
public static void main(String[] args) {
ListNode second1 = new ListNode(4, null);
ListNode first1 = new ListNode(2, second1);
ListNode list1 = new ListNode(1, first1);
ListNode second2 = new ListNode(4, null);
ListNode first2 = new ListNode(3, second2);
ListNode list2 = new ListNode(1, first2);
ListNode curr = mergeTwoLists(list1, list2);
while (curr != null) {
System.out.println(curr.val);
curr = curr.next;
}
}
}
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