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Sword finger offer 64 Find 1 + 2 +... + n

2022-07-18 11:09:00 【Ding Jiaxiong】

subject

seek 1+2+…+n , The requirement is not to use Multiplication and division 、for、while、if、else、switch、case Wait for keywords and conditional statements （A?B:C）.

Example 1：

Input : n = 3
Output : 6

Example 2：

Input : n = 9
Output : 45

Limit ：

1 <= n <= 10000

Answer key 

class Solution:
    def sumNums(self, n: int) -> int:
        return n and (n + self.sumNums(n-1))

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本文为[Ding Jiaxiong]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/199/202207152315419867.html

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