/* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { // public: /* ListNode* ReverseList(ListNode* pHead) { ListNode *r = nullptr; while (pHead) { ListNode *t = pHead->next; pHead->next = r; r = pHead; pHead = t; } return r; } */ /...