/in/foo.cc: In function 'int main()':
/in/foo.cc:26:8: warning: variable 't' set but not used [-Wunused-but-set-variable]
    int t;
        ^
/in/foo.cc:33:8: error: 'i' was not declared in this scope
   for (i=1;i<=n;i++)
        ^
/in/foo.cc:6:36: warning: unused variable 'most' [-Wunused-variable]
  int n,a[max],num[max],sum,top,ave,most;
                                    ^~~~
/in/foo.cc:7:7: warning: unused variable 'ismost' [-Wunused-variable]
  bool ismost[max];
       ^~~~~~