foo.cc: In function 'void PX(int*, int)':
foo.cc:6:10: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int i;i<n;i++)
          ^
foo.cc: In function 'int main()':
foo.cc:6:10: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]

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