/in/foo.cc: In function 'void build(int&, int, int)':
/in/foo.cc:18:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void insert(int&, int, int, int, int, int)':
/in/foo.cc:26:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l+r>>1;
            ~^~
/in/foo.cc: In function 'void update(int, int, int, int)':
/in/foo.cc:34:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l+r>>1;
            ~^~
/in/foo.cc: In function 'int query(int, int, int, int)':
/in/foo.cc:42:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = l+r>>1;
            ~^~