/** * struct ListNode { * int val; * struct ListNode *next; * }; * * C语言声明定义全局变量请加上static,防止重复定义 */ /** * 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 */ struct ListNode* middleNode(struct ListNode* head ) { // write code here struct ListNode* slow = head; struct ListNode* fast = head; while(fast && fast->next) { fast = fast->next->next; slow = slow->next; } return slow; }