/in/foo.cc: In function 'int main()':
/in/foo.cc:176:8: warning: unused variable 'hi' [-Wunused-variable]
  176 |     ll hi = (ll)4e18;
      |        ^~
/in/foo.cc:178:8: warning: unused variable 'lo' [-Wunused-variable]
  178 |     ll lo = 0;
      |        ^~
/in/foo.cc: At global scope:
/in/foo.cc:20:11: warning: 'll ceildiv(ll, ll)' defined but not used [-Wunused-function]
   20 | static ll ceildiv(ll a, ll b) { ll q = a / b; if ((a % b != 0) && ((a < 0) == (b < 0))) q++; return q; }
      |           ^~~~~~~
/in/foo.cc:19:11: warning: 'll floordiv(ll, ll)' defined but not used [-Wunused-function]
   19 | static ll floordiv(ll a, ll b) { ll q = a / b; if ((a % b != 0) && ((a < 0) != (b < 0))) q--; return q; }
      |           ^~~~~~~~