/in/foo.cc: In function 'int build(int, int)':
/in/foo.cc:29:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void modify(int, int, int, int)':
/in/foo.cc:35:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'node query(int, int, int, int, int)':
/in/foo.cc:43:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~