[LeedCode OJ]#206 Reverse Linked List

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution
{
	public:
		ListNode* reverseList(ListNode* head)
		{
			ListNode *pre = nullptr;
			ListNode *newhead = nullptr;
			ListNode *node = head;
			while(node!=nullptr)
			{
				ListNode *next = node->next;
				if(next==nullptr)
					newhead = node;
				node->next = pre;
				pre=node;
				node = next;
			}
			return newhead;
		}
};