/in/foo.cc: In function 'int main()':
/in/foo.cc:10:28: warning: iteration 1000003 invokes undefined behavior [-Waggressive-loop-optimizations]
   10 |                 if(primes[i])
      |                    ~~~~~~~~^
/in/foo.cc:9:22: note: within this loop
    9 |         for(int i=2;i<=1e6+5;i++)
      |                     ~^~~~~~~