foo.cc: In function 'int main()':
foo.cc:22:23: warning: iteration 9999999 invokes undefined behavior [-Waggressive-loop-optimizations]
   22 |                 if(h[i])
      |                    ~~~^
foo.cc:21:22: note: within this loop
   21 |         for(int i=1;i<=10000000;i++)
      |                     ~^~~~~~~~~~

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