题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input())
sum=0
for i in range(n+1):
# 每一项的通项公式:ix(n-(i-1))
sum=i*(n-(i-1))+sum
print(sum)
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
n=int(input())
sum=0
for i in range(n+1):
# 每一项的通项公式:ix(n-(i-1))
sum=i*(n-(i-1))+sum
print(sum)
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