foo.cc: In function 'int main()':
foo.cc:7:12: warning: overflow in implicit constant conversion [-Woverflow]
  int amax=-9999999999,bmax=-9999999999;
            ^~~~~~~~~~
foo.cc:7:29: warning: overflow in implicit constant conversion [-Woverflow]
  int amax=-9999999999,bmax=-9999999999;
                             ^~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。