运行 ID: 44640

Main.cc: In function ‘int main()’:
Main.cc:7:10: error: cannot convert ‘std::__cxx11::string {aka std::__cxx11::basic_string}’ to ‘int’ in initialization
  int len=s,size();
          ^
Main.cc:11:7: warning: unused variable ‘flag’ [-Wunused-variable]
  bool flag=1;
       ^~~~