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LeetCode-86-Partition-List.java
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LeetCode-86-Partition-List.java
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/*
LeetCode: https://leetcode.com/problems/partition-list/
LintCode: http://www.lintcode.com/problem/partition-list/
JiuZhang: http://www.jiuzhang.com/solutions/partition-list/
ProgramCreek: http://www.programcreek.com/2013/02/leetcode-partition-list-java/
Analysis:
*/
/**
* 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 || head.next == null) return head;
ListNode smallDummy = new ListNode(-1);
ListNode small = smallDummy;
ListNode bigDummy = new ListNode(-1);
ListNode big = bigDummy;
while (head != null) {
if (head.val < x) {
small.next = head;
small = small.next;
} else {
big.next = head;
big = big.next;
}
head = head.next;
}
big.next = null;
small.next = bigDummy.next;
return smallDummy.next;
}
}