/in/foo.cc: In function 'int main()':
/in/foo.cc:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<p.size();i++)
                 ~^~~~~~~~~
/in/foo.cc:41:9: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized]
     n=ii-'I';
       ~~^~~~