/in/foo.cc: In function 'int main()':
/in/foo.cc:19:43: warning: iteration 1919809 invokes undefined behavior [-Waggressive-loop-optimizations]
     for(int i = 1; i <= 1919810;i++) p[i] = i;
                                      ~~~~~^~~
/in/foo.cc:19:22: note: within this loop
     for(int i = 1; i <= 1919810;i++) p[i] = i;
                    ~~^~~~~~~~~~