/in/foo.cc: In member function 'void Segment_Tree::Modify(int, int, int, int, int)':
/in/foo.cc:30:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1;
             ~~^~~
/in/foo.cc: In member function 'int Segment_Tree::query(int, int, int, int, int)':
/in/foo.cc:37:24: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int res = 0, mid = l + r >> 1;
                      ~~^~~