/* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { public: ListNode* ReverseList(ListNode* pHead) { ListNode* p,* temp; if(pHead==nullptr) { return nullptr; } else { p=pHead->next; pHead->next=nullptr; while(p!=nullptr) { temp=p->next; p->next=pHead; pHead=p; p=temp; } return pHead; } } };