/in/foo.cc: In function 'int main()':
/in/foo.cc:14:8: warning: iteration 200000 invokes undefined behavior [-Waggressive-loop-optimizations]
   f[i] = a * tmp * tmp * tmp + b * tmp * tmp + c * tmp + d;
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:12:20: note: within this loop
  for (int i = 1; i <= 200001; i++) {
                  ~~^~~~~~~~~