/in/foo.cc: In function 'bool Div(int, int, int, int)':
/in/foo.cc:76:35: warning: variable 'ps' set but not used [-Wunused-but-set-variable]
     b[1] = tmp[1].y; int len = 1, ps;
                                   ^~
/in/foo.cc:100:29: warning: variable 'last_lid' set but not used [-Wunused-but-set-variable]
     int l_id = 1, r_id = 0, last_lid = 1, last_rid = 0;
                             ^~~~~~~~