/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: ListNode* AddList(ListNode *pHead1,ListNode *pHead2) { ListNode *head = new ListNode(0); head ->next = pHead1; ListNode *res = head;...