/in/foo.cc: In function 'int main()':
/in/foo.cc:6:33: warning: format '%s' expects argument of type 'char*', but argument 5 has type 'std::__cxx11::string* {aka std::__cxx11::basic_string<char>*}' [-Wformat=]
  scanf("%d%d%d%s%s",&n,&m,&k,a,b);
                                 ^
/in/foo.cc:6:33: warning: format '%s' expects argument of type 'char*', but argument 6 has type 'std::__cxx11::string* {aka std::__cxx11::basic_string<char>*}' [-Wformat=]