Unhappy Hacking II

阿新 • • 發佈：2018-05-19

const 字符串 pri ast hat launched def ssi fin

const 字符串 pri ast hat launched def ssi fin

題目連結題意：你有n次操作，每次操作可以在之前得到的串後面加一個0或加一個1或者刪除最後一個字元，如果沒有字元則刪除操作後扔是空串。給你一個01串，問n次操作後有多少種方法能得到這個01串，模1e9+7。n<=5000 題解：難得自己想出一道還有一定思維含量的計數題。

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