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Meow
===== C =====
Red:
注意到前缀和需要有序之类的东西，然后交给睿睿。
Dirty: 初始情况处理问题。
===== M =====
Red:
签到。mian 手速好快，我们都抢不到校内一血。
Dirty: 无
===== I =====
toby:
题意是给定 n 个只包含 01? 的字符串，其中 ? 表示通配符，问能匹配多少个 01 串。
思路是直接放在字典树里面就可以了。当一个结点，既有 ? 又有 0 或 1 时，将 ? 复制成两份，分别放在 0 的位置和 1 的位置即可。
为了避免拷贝过多，我应用了 copy-on-write，但是似乎没有必要。
====== 场上没过的题 ======
===== F =====
Red:
生成函数ntt。见少了根本没向这个方向思考。场下听到ntt后秒了。