作业126页E2 1,2,3
1.Node *p0=new Node('0'); Node *p1=p0 -> next=new Node('1');
2.Node *p0=new Node('0'); Node *p1=new Node('1',p0); Node *p2=p1;
3.Node *p0=new Node('0'); Node *p1=p0 ->next=new Node('1'); Node *p2=p1 ->next=new Node('2',p1);
1.Node *p0=new Node('0'); Node *p1=p0 -> next=new Node('1');
2.Node *p0=new Node('0'); Node *p1=new Node('1',p0); Node *p2=p1;
3.Node *p0=new Node('0'); Node *p1=p0 ->next=new Node('1'); Node *p2=p1 ->next=new Node('2',p1);