/in/foo.cc: In function 'void work()':
/in/foo.cc:108:27: warning: variable 'tmpy' set but not used [-Wunused-but-set-variable]
             int tmpx = x, tmpy, tmp;
                           ^~~~
/in/foo.cc:130:35: warning: 'tmp' may be used uninitialized in this function [-Wmaybe-uninitialized]
             ansy = s[root] - s[tmp];
                              ~~~~~^