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feat: finish homework2 #64

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feat: finish homework2 #64

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hebangwen
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  1. 两个指针会造成什么问题？循环引用，内存无法释放。
  2. 构造函数的改进？用初始化构造函数
  3. 应该输出13次，少了就是因为最开始的两个循环引用的指针。
  4. 深拷贝的实现：通过遍历指针得到整个链表保存的数据
  5. 为什么删除拷贝赋值函数也不报错？因为List b = a; 实际上调用的是拷贝构造函数，List b; b = a; 调用的才是拷贝复制函数，才会无法编译通过。
  6. print 函数有什么值得改进的？将值传递改为引用传递。

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