/in/foo.cc:6:1: error: expected ';' after struct definition
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:10: error: 'K' was not declared in this scope
  cin>>n>>K;
          ^
/in/foo.cc:20:14: error: expected primary-expression before '.' token
  sort(student.begin(),students.end(),compare);
              ^