/in/foo.cc: In function 'int main()':
/in/foo.cc:14:9: warning: iteration 100005 invokes undefined behavior [-Waggressive-loop-optimizations]
   if(x[i]>x[y]) y=i;
      ~~~^
/in/foo.cc:13:15: note: within this loop
  for(int i=0;i<=100005;i++){
              ~^~~~~~~~