/in/foo.cc: In function 'void update(int, int, int&, int, int)':
/in/foo.cc:16:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'int query(int, int, int, int, int)':
/in/foo.cc:23:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc:27:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^