/in/foo.cc: In function 'int main()':
/in/foo.cc:27:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=2;i<strlen(e);i++)
               ~^~~~~~~~~~
/in/foo.cc:52:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<strlen(e);i++)
               ~^~~~~~~~~~
/in/foo.cc:69:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int j=i+2;j<strlen(e);j++)
                    ~^~~~~~~~~~