View Compilation Error

0_0_23160682_16002.cpp:12:3: error: expected unqualified-id before '--' token
   ----------------------//  int main()  {          unsigned n;  // BST ??????
   ^
0_0_23160682_16002.cpp:15:215: error: expected unqualified-id before 'return'
                   cout<< costof_OptBST( n ) <<endl;                  /*                  // ??????? BST                  print_OptBST( 1, n );                  cout<<endl;                  */          }            return 0;  }  //--------------------- ?????? ----------------------//  //---------------------  ????
                                                                                                                                                                                                                       ^
0_0_23160682_16002.cpp:15:226: error: expected declaration before '}' token
                   cout<< costof_OptBST( n ) <<endl;                  /*                  // ??????? BST                  print_OptBST( 1, n );                  cout<<endl;                  */          }            return 0;  }  //--------------------- ?????? ----------------------//  //---------------------  ????
                                                                                                                                                                                                                                  ^