/in/foo.cc: In function 'int main()':
/in/foo.cc:31:16: warning: iteration 999999 invokes undefined behavior [-Waggressive-loop-optimizations]
         if (t[i]){
             ~~~^
/in/foo.cc:30:19: note: within this loop
     for (int i=1;i<=1000000;i++){
                  ~^~~~~~~~~