foo.cc: In function 'int main()':
foo.cc:9:19: error: 'setpretion' was not declared in this scope
      cout<<fixed<<setpretion(1)<<c<<endl;
                   ^~~~~~~~~~
foo.cc:9:19: note: suggested alternative: 'strptime'
      cout<<fixed<<setpretion(1)<<c<<endl;
                   ^~~~~~~~~~
                   strptime

[Hydro](https://hydro.ac)提供评测服务