/in/foo.cc:4:2: error: 'string' does not name a type
  string name;
  ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:3: error: 'cin' was not declared in this scope
   cin >> student[i].name;
   ^~~
/in/foo.cc:12:3: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:12:21: error: 'struct student' has no member named 'name'
   cin >> student[i].name;
                     ^~~~
/in/foo.cc:22:36: error: 'struct student' has no member named 'name'
  printf("%s\n%d\n%d", student[mid].name, student[mid].total, score);
                                    ^~~~