/* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { public: ListNode* Merge(ListNode* pHead1, ListNode* pHead2) { ListNode * head = new ListNode(-1); ListNode * last = head; if (pHead1 == nullptr && pHead2 == nullptr) { return nullptr; ...