LeetCode Reverse Linked List

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下面是迭代的方法

/** * Definition for singly-linked list. * struct ListNode { *     int val; *     struct ListNode *next; * }; */struct ListNode* reverseList(struct ListNode* head) {    struct ListNode *p = head;    //struct ListNode *k= head;    if(p){        struct ListNode *q = p->next,*k;         while(q){        k = q->next;        q->next = p;        p = q;        q =k;    }   head->next=NULL;    return p;    }    else        return NULL;}

递归的方法如下

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