题解 | #牛牛学数列4#
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input()) m=0 s=0 for i in range(1,n+1): m+=i s+=m print(s)
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input()) m=0 s=0 for i in range(1,n+1): m+=i s+=m print(s)
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