/in/foo.cc: In function 'int main()':
/in/foo.cc:26:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   for(int k=p;k>g;k--)
                 ^
/in/foo.cc:27:20: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
      for(int j=r;j>u;j--)
                    ^