/in/foo.cc: In function 'void add(std::__cxx11::string)':
/in/foo.cc:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < st.length(); i++)
                     ~~^~~~~~~~~~~~~
/in/foo.cc: In function 'int getans(std::__cxx11::string)':
/in/foo.cc:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < p.length(); i++)
                     ~~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:104:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < p.length(); i++)
                     ~~^~~~~~~~~~~~
/in/foo.cc: In function 'int getasd(char)':
/in/foo.cc:38:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^