class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param head ListNode类 * @return ListNode类 */ ListNode* ReverseList(ListNode* head) { if(head == nullptr) return head; ListNode* dummy = head; ListNode* left = head; ListNode* right = head->next; while(right != nullptr) { ListNode* next = right->next; right->next = left; left = right; right = next; } dummy->next = nullptr; return left; } };
引入虚拟节点解决问题