/in/foo.cc: In function 'int main()':
/in/foo.cc:29:13: warning: iteration 991 invokes undefined behavior [-Waggressive-loop-optimizations]
         a[i]=a[i/10]+a[i%10];
         ~~~~^~~~~~~~~~~~~~~~
/in/foo.cc:27:19: note: within this loop
     for(int i=10;i<=2000;i++)
                  ~^~~~~~