/in/foo.cc: In function 'int main()':
/in/foo.cc:9:11: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
    {if(a[i]<=(num+30))
        ~~~^
/in/foo.cc:8:13: note: within this loop
    for(i=0;i<=9;i++)
            ~^~~