Long_hw_02 #77
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Long_hw_02 #77
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1.将共享指针改为unique+raw的组合，避免循环相互使用导致计数器不归零不释放,这里也是为什么析构函数次数不对的原因
2.把构造函数改为const &类型
3.优化了insert，原来的并没有删除多余节点
4.另外测试了一下，这里的insert逻辑上不是单纯插入而是会替换掉原来的数据，有没有更好的实现方法呢