* struct ListNode { * int val; * struct ListNode *next; * }; */ class Solution { public: /** * * @param head ListNode类 * @param k int整型 * @return ListNode类 */ ListNode* reverseKGroup(ListNode* head, int k) { // write code here if(!head||k<=1) return head; ListNode *cur,*r,*l; cur=head,r=NULL,l=NU...