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):
S = S+(-1)**(i-1)*i
print (S)
牛牛学数列
https://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
n = int(input())
S = 0
for i in range (1,n+1):
S = S+(-1)**(i-1)*i
print (S)
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