foo.cc: In function 'int main()':
foo.cc:26:15: warning: 'tmp2' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int tmp1;int tmp2;
               ^~~~
foo.cc:26:6: warning: 'tmp1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int tmp1;int tmp2;
      ^~~~

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