foo.cc: In function 'int main()':
foo.cc:7:30: error: 'setiosflags' was not declared in this scope
  cout<<setiosflags(ios::fixed)<<setprecision(2);
                              ^
foo.cc:7:47: error: 'setprecision' was not declared in this scope
  cout<<setiosflags(ios::fixed)<<setprecision(2);
                                               ^

自豪的采用jd5进行评测(github.com/masnn/jd5)