代码:

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 * };
 */

/**
 * @author Senky
 * @date 2023.03.17
 * @par url https://www.nowcoder.com/creation/manager/content/584337070?type=column&status=-1
 * @param pHead ListNode类 
 * @return ListNode类
 */
struct ListNode* ReverseList(struct ListNode* pHead ) {
    // write code here
   
    struct ListNode* prev = NULL;
    struct ListNode* curr = pHead;
    struct ListNode* next;

    //退出循环后curr指向NULL
    while(curr != NULL)
    {
        next = curr->next;
        curr->next = prev;
        prev = curr;
        curr = next;
    }
    return prev;
}

图解：