foo.cc: In function 'int main()':
foo.cc:12:23: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
   12 |                 if(a[i]<=b+30) sum++;
      |                    ~~~^
foo.cc:11:16: note: within this loop
   11 |         while(i<=10){
      |               ~^~~~

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