Изменения

*Такое же как у дерева dfs. [http://neerc.ifmo.ru/wiki/index.php?title=%D0%9E%D0%B1%D1%85%D0%BE%D0%B4_%D0%B2_%D0%B3%D0%BB%D1%83%D0%B1%D0%B8%D0%BD%D1%83,_%D1%86%D0%B2%D0%B5%D1%82%D0%B0_%D0%B2%D0%B5%D1%80%D1%88%D0%B8%D0%BD#.D0.94.D0.B5.D1.80.D0.B5.D0.B2.D0.BE_.D0.BE.D0.B1.D1.85.D0.BE.D0.B4.D0.B0_.D0.B2_.D0.B3.D0.BB.D1.83.D0.B1.D0.B8.D0.BD.D1.83]