/in/foo.cc: In function 'int main()':
/in/foo.cc:10:12: warning: iteration 200u invokes undefined behavior [-Waggressive-loop-optimizations]
   x[size]=i;
            ^
/in/foo.cc:8:15: note: containing loop
  for(int i=1;i<4000;i+=2){
               ^
/in/foo.cc:6:14: warning: 'r[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int l[1000],r[1000];
              ^
/in/foo.cc:6:6: warning: 'l[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int l[1000],r[1000];
      ^