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notes/60. n 个骰子的点数.md
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把 n 个骰子扔在地上，求点数和为 s 的概率。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/195f8693-5ec4-4987-8560-f25e365879dd.png" width="300px"> </div><br>
![](https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/195f8693-5ec4-4987-8560-f25e365879dd.png)\
## 解题思路
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使用一个二维数组 dp 存储点数出现的次数，其中 dp\[i]\[j] 表示前 i 个骰子产生点数 j 的次数。
空间复杂度：O(N<sup>2</sup>)
空间复杂度：O(N2)
```java
public List<Map.Entry<Integer, Double>> dicesSum(int n) {