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+=(-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+=(-1)**(i-1)*i print(s)
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