题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
n=int(input())
def sum(n):
if n==1:
return 1
else:
return sum(n-1)+(-1)**(n-1)*n
print(sum(n))
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
n=int(input())
def sum(n):
if n==1:
return 1
else:
return sum(n-1)+(-1)**(n-1)*n
print(sum(n))
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