/in/foo.cc: In function 'int main()':
/in/foo.cc:36:13: warning: iteration 5 invokes undefined behavior [-Waggressive-loop-optimizations]
    a[i]=(a[i]*f[i])%49999+1;
          ~~~^
/in/foo.cc:32:18: note: within this loop
   for (int i=1; i<=6; i++) 
                 ~^~~