foo.cc: In function 'int main()':
foo.cc:8:5: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
  n=a*a*a+b*b*b+c*c*c;
    ~^~
foo.cc:8:11: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
  n=a*a*a+b*b*b+c*c*c;
          ~^~
foo.cc:8:17: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  n=a*a*a+b*b*b+c*c*c;
                ~^~

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