@[crzcqh](/user/769006) 看题啊，说了根节点是第一组数据第一个字符啊
by _AC_problem_er_ @ 2023-07-09 11:08:42
哦,谢谢！！
by 菜のcrzOvO @ 2023-07-09 15:13:09
~~蒟蒻不看题~~
by 菜のcrzOvO @ 2023-07-09 15:14:53