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PartitionList.java

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public class PartitionList {

ListNode partition(ListNode head, int x) {

ListNode node1 = new ListNode(0);

ListNode node2 = new ListNode(0);

ListNode p1 = node1, p2 = node2;

while (head != null) {

if (head.val < x)

p1 = p1.next = head;

else

p2 = p2.next = head;

head = head.next;

}

p2.next = null;

p1.next = node2.next;

return node1.next;

}

}