/in/foo.cc: In function 'int main()':
/in/foo.cc:12:7: warning: iteration 200001 invokes undefined behavior [-Waggressive-loop-optimizations]
   a[i]=i;
   ~~~~^~
/in/foo.cc:10:15: note: within this loop
  for(int i=0;i<=200001;i++) 
              ~^~~~~~~~