/in/foo.cc: In function 'void buildtree(int, int, int)':
/in/foo.cc:29:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m = (l + r >> 1);
           ~~^~~
/in/foo.cc: In function 'void update(int, int, int, int, int)':
/in/foo.cc:39:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m = (l + r >> 1);
           ~~^~~
/in/foo.cc: In function 'Node query(int, int, int, int, int)':
/in/foo.cc:46:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m = (l + r >> 1);
           ~~^~~