/in/foo.cc: In function 'int main()':
/in/foo.cc:17:19: warning: unused variable 'you' [-Wunused-variable]
  double d1,c,d2,p,you=0.0,fei=0.0,minn,ans=10000000.0;
                   ^~~
/in/foo.cc:17:27: warning: unused variable 'fei' [-Wunused-variable]
  double d1,c,d2,p,you=0.0,fei=0.0,minn,ans=10000000.0;
                           ^~~
/in/foo.cc:17:35: warning: unused variable 'minn' [-Wunused-variable]
  double d1,c,d2,p,you=0.0,fei=0.0,minn,ans=10000000.0;
                                   ^~~~
/in/foo.cc:17:40: warning: unused variable 'ans' [-Wunused-variable]
  double d1,c,d2,p,you=0.0,fei=0.0,minn,ans=10000000.0;
                                        ^~~
/in/foo.cc:18:10: warning: unused variable 'j' [-Wunused-variable]
  int n,i,j,now,hao;
          ^
/in/foo.cc:18:12: warning: unused variable 'now' [-Wunused-variable]
  int n,i,j,now,hao;
            ^~~
/in/foo.cc:18:16: warning: unused variable 'hao' [-Wunused-variable]
  int n,i,j,now,hao;
                ^~~