/in/foo.cc: In function 'int main()':
/in/foo.cc:12:21: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
         if(n+30>=a[i])s=s+1;
                  ~~~^
/in/foo.cc:10:18: note: within this loop
     for(int i=1;i<=10;i++)
                 ~^~~~