/in/foo.cc: In function 'int main()':
/in/foo.cc:14:23: warning: iteration 999 invokes undefined behavior [-Waggressive-loop-optimizations]
   14 |                 if(s[i]!=0)
      |                    ~~~^
/in/foo.cc:12:22: note: within this loop
   12 |         for(int i=1;i<=1000;i++)
      |                     ~^~~~~~