[LeetCode] 837. New 21 Game 新二十一點游戲
Alice plays the following game, loosely based on the card game "21". Alice starts with 0 points, and draws numbers while she has less ...
原文：【leetcode】837. New 21 Game
題目如下： 解題思路：這個題目有點像爬樓梯問題，只不過樓梯問題要求的計算多少種爬的方式，但是本題是計算概率。因為點數超過或者等於K后就不允許再增加新的點數了，因此我們可以確定最終Alice擁有的點數的區間是 K,K W ，下限等於K很好理解，Alice最后一次抽取點數前可能擁有的點數最大值是K ，最后一次抽取的點數最大值是W,因此上限就是K W。和爬樓梯類似，恰好獲得點數n的概率dp n sum ...
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