Wrong Answer
foo.cc: In function 'int main()':
foo.cc:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
56 | for(int i=0;i<list.size();i++){ //循环每一个商品
| ~^~~~~~~~~~~~
[Hydro](https://hydro.ac)提供评测服务