/in/foo.cc: In function 'bool check(int, int)':
/in/foo.cc:34:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(p1==strlen(b)) return true;
     ~~^~~~~~~~~~~
/in/foo.cc:35:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(p2==strlen(a)) return false;
     ~~^~~~~~~~~~~