题解 | 牛牛学数列
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
n = int(input())
s = 0
for i in range(1,n+1):
if (i % 2 == 0):
num = -1
else:
num = 1
s += i * num
print(s)
02-22 15:44 发布于湖北
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