/in/foo.cc: In constructor 'ThreesPow::ThreesPow()':
/in/foo.cc:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < _size - 1; i++) {
                        ~~^~~~~~~~~~~
/in/foo.cc: In member function 'LL_t Gen753::get_back()':
/in/foo.cc:86:22: warning: unused variable 't' [-Wunused-variable]
                 LL_t t= buf[ctr];
                      ^