/in/foo.cc: In member function 'int segment_tree::query(int, int, int, int, int)':
/in/foo.cc:15:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int ret=0,mid=l+r>>1;
                 ~^~
/in/foo.cc: In member function 'void segment_tree::update(int, int, int, int, int)':
/in/foo.cc:22:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=l+r>>1;
           ~^~