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java 反转链表

2018-03-25 12:43 225 查看
public class ListNode {    int val;    ListNode next = null;     ListNode(int val) {        this.val = val;    }public class Solution {    public ListNode ReverseList(ListNode head) {        if(head==null)            return null;        ListNode newHead = null;        ListNode pNode = head;        ListNode pPrev = null;        while(pNode!=null){            ListNode pNext = pNode.next;            if(pNext==null)                newHead = pNode;            pNode.next = pPrev;            pPrev = pNode;            pNode = pNext;        }        return newHead;    }}
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