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Solution.java
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55 lines (49 loc) · 1.35 KB
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/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode partition(ListNode head, int x) {
if (head == null) {
return null;
}
ListNode ltHead = null;
ListNode ltNode = null;
ListNode geHead = null;
ListNode geNode = null;
ListNode currNode = head;
while (currNode != null) {
if (currNode.val < x) {
if (ltHead == null) {
ltHead = currNode;
ltNode = currNode;
} else {
ltNode.next = currNode;
ltNode = ltNode.next;
}
} else {
if (geHead == null) {
geHead = currNode;
geNode = currNode;
} else {
geNode.next = currNode;
geNode = geNode.next;
}
}
currNode = currNode.next;
}
if (geNode != null) {
geNode.next = null;
}
if (ltNode != null) {
ltNode.next = geHead;
} else {
ltHead = geHead;
}
return ltHead;
}
}