[LeetCode] 837. New 21 Game 新二十一点游戏
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
题目如下： 解题思路：这个题目有点像爬楼梯问题，只不过楼梯问题要求的计算多少种爬的方式，但是本题是计算概率。因为点数超过或者等于K后就不允许再增加新的点数了，因此我们可以确定最终Alice拥有的点数的区间是 K,K W ，下限等于K很好理解，Alice最后一次抽取点数前可能拥有的点数最大值是K ，最后一次抽取的点数最大值是W,因此上限就是K W。和爬楼梯类似，恰好获得点数n的概率dp n sum ...
2018-05-23 11:31 0 1636 推荐指数：
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