/in/foo.cc: In function 'int main()':
/in/foo.cc:74:8: warning: iteration 104 invokes undefined behavior [-Waggressive-loop-optimizations]
   yv[i]=yv[i-1]*r;
   ~~~~~^~~~~~~~~~
/in/foo.cc:72:15: note: within this loop
  for(int i=1;i<=105;i++)
              ~^~~~~