/in/foo.cc: In function 'int main(int, const char**)':
/in/foo.cc:40:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int k = 0; k < gg[i].size(); ++k) {
                        ~~^~~~~~~~~~~~~~
/in/foo.cc:41:26: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
           int p = gg[i][p];
                          ^