题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input())
i=1
k=1
a=0
while i<=n:
a=k+a
i+=1
k=k+i
print(a)
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input())
i=1
k=1
a=0
while i<=n:
a=k+a
i+=1
k=k+i
print(a)
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