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Implement an algorithm to delete a node in the middle of a single linked list, given only access to that node. EXAMPLE Input: the node ‘c’ from the linked list a->b->c->d->e

Result: nothing is returned, but the new linked list looks like a->b->d->e

编程之美上的题目，只需要删除该节点的后一个节点，并将后一个节点的data拷贝过来。

void delete_mid(Node* mid){	if(mid==NULL) return;	Node* p=mid->next;	if(p==NULL) return;	mid->next=p->next;	mid->data=p->data;	delete p;}

注意：这里不能处理最后一个节点的情况

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