leetcode-206. 反转链表
灵活运用了双指针,一快一慢两个指针
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16class Solution {
public:
ListNode* reverseList(ListNode* head) {
ListNode* pre = NULL;
ListNode* cur = head;
ListNode* temp; //用临时节点储存cur的下个节点。
while(cur != NULL)
{
temp = cur->next;
cur->next = pre;
pre = cur;
cur = temp;
}
return pre;
}
};