hw02 #84
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hw02 #84
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-避免函数参数不必要的拷贝 改为 const & - 修复智能指针造成的问题 双share_ptr应改后一个为weak_ptr - 改用 `unique_ptr<Node> - 实现拷贝构造函数为深拷贝 - 说明为什么可以删除拷贝赋值函数 根据三五法则，定义了拷贝构造，需要同时定义或删除拷贝赋值函数 - 改进 `Node` 的构造函数
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-避免函数参数不必要的拷贝
改为 const &
Node的构造函数