运行 ID: 137277

Main.cc:24:31: error: expected ‘;’ at end of member declaration
  bool operator < (const List&c) > const
                               ^
Main.cc:24:33: error: expected unqualified-id before ‘>’ token
  bool operator < (const List&c) > const
                                 ^
Main.cc: In function ‘int main()’:
Main.cc:62:2: error: expected ‘;’ before ‘}’ token
  }
  ^
Main.cc:61:9: warning: statement has no effect [-Wunused-value]
   ls[idx]
   ~~~~~~^