foo.cc: In function 'int main()':
foo.cc:13:15: warning: iteration 1004 invokes undefined behavior [-Waggressive-loop-optimizations]
   13 |         if(d[j])
      |            ~~~^
foo.cc:11:18: note: within this loop
   11 |     for(int j=1;j<=1005;j++)
      |                 ~^~~~~~
foo.cc:19:15: warning: iteration 1004 invokes undefined behavior [-Waggressive-loop-optimizations]
   19 |         if(d[y])
      |            ~~~^
foo.cc:17:18: note: within this loop
   17 |     for(int y=1;y<=1005;y++)
      |                 ~^~~~~~

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