摘要:        
#include<iostream>using namespace std;template<typename T> class Node{public:	T key;	Node *pre;	Node *next;	Node(T x)	{ key = x; pre = nullptr; next = nullptr;	}};template<typename NodeT,typename keyT> class List{public:	NodeT *head;	bool isEmpty()	{ if(head == nullptr) return true    
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