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